Maths Year 1 Notes

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176 Terms

1
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P → Q
P implies Q or if P is true then Q is true or P is sufficient for Q
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P ← Q
P is implied by Q or if Q is true then P is true or P is necessary for Q
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P ↔ Q
P is equivalent to Q or Q is true if and only if P is true
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x ∈ ( a , b )
a < x < b
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x ∈ \[ a , b \]
a ≤ x ≤ b
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x ∈ \[ a , b )
a ≤ x < b
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x ∈ ( a , b \]
a < x ≤ b
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x ∈ A ∪ B
Union of A and B where x can be in either A or B or both
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x ∈ A ∩ B
Intersection of A and B where x is in both A and B
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x ∈ ∅
No solutions to the inequality
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Symbol for an empty set
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a^n × a^m
a^(m+n)
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a^(1/n)
n√a
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a^m ÷ a^n
a^(m-n)
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a^(m/n)
n√a^m
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(a^m)^n
a^(m × n)
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a^n × b^n
(ab)^n
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a^0
1
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a^n ÷ b^n
(a/b)^n
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a^(-n)
1/a^n
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Rationalize the denominator
Multiply the top and bottom of the fraction by an appropriate expression to create a difference of two squares
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Positive parabola
a > 0
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Negative parabola
a < 0
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y-intercept
Value of c in quadratic equation, (0,c)
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Quadratic equation
ax² + bx + c
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Complete the square formula
a(x+p)²+q
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Turning point of graph
(-p,q) from completing the square
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Line of symmetry
x = -p = (x₁+x₂)/2
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Quadratic formula
(-b±√b²-4ac)/2a
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Discriminant
∆ = b² - 4ac
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Graph has two real roots
∆ > 0
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Graph has one real root
∆ = 0
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Graph has no real roots
∆ < 0
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Factor theorem
(ax+b) is a factor of a polynomial f(x) if and only if f(-b/a) = 0
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Polynomial
ax^k
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y = f(x) + c
Translation c up
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y = f(x+d)
Translation d to the left
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y = pf(x)
Vertical stretch, scale factor p relative to the x-axis
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y = f(qx)
Horizontal stretch, scale factor 1/q relative to the y-axis
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y = -f(x)
Reflection in the x-axis
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y = f(-x)
Reflection in the y-axis
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Direct proportion
y = kx
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Inverse proportion
y = k/x
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Distance between two points
√(x₂ - x₁) + (y₂ - y₁)
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Midpoint of two points
( (x₁+x₂)/2 , (y₁+y₂) )
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Gradient of a line
m = (y₂-y₁) / (x₂-x₁)
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Method to find equation of straight line
y - y₁ = m (x - x₁)
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Equation of a straight line
y = mx + c / ax + by + c = 0
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Parallel lines
Have the same gradient
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Perpendicular lines
m₁ m₂ = -1
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Equation of a circle
(x - a)² + (y - b)² = r²
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Tangent
Perpendicular to the radius
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Normal
Same direction as radius
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b^c = a
logb(a)
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log10(x)
log(x)
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loga(x^a)
x=a^(loga(x))
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loge(x) / natural logarithm
In(x)
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loga(x) + loga(y)
loga(xy)
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loga(x) - loga(y)
loga(x/y)
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loga(1/x)
\-loga(x)
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loga(x^k)
kloga(x)
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loga(1)
0
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loga(a)
1
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Graph of y=a^x
y-intercept is (0,1) and x-axis is an asymptote
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Gradient of e^(kx)
ke^(kx)
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Ae^(kt) model
Initial value is A and the rate of change equals ky
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Graph of y=In(k)
Passes through (1,0) and y-axis is an asymptote
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Convert y=ax^n
log(y) = log(a) + nlog(x)
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log(y) = log(a) + nlog(x)
y-intercept is log(a) and gradient is n
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Binomial theorem
(a+b)ⁿ = ⁿC₀aⁿb⁰ + ⁿC₁aⁿ⁻¹b¹ + … + ⁿCₙa⁰bⁿ
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ⁿCr
n! / r!(n-r)!
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n!
n × (n-1) × … × 3 × 2 × 1
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0!
1
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sin(x)
sin(180-x) = sin(x+360)
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sin(180+x)
sin(-x) = -sin(x)
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cos(x)
cos(-x) = cos (x+360)
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cos(180-x)
cos(180+x) = -cos(x)
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tan(x)
tan(x+180) = tan(x+360) = …
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Tan graph asymptotes
x = 90° , x = 270° etc
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Period of sine and cosine graph
360°
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Period of tan graph
180°
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cos(90-x)
sin(x)
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sin(90-x)
cos(x)
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tan(x) identity
tan(x) ≡ sin(x) / cos(x)
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sin(x) and cos(x) identity
sin²(x) + cos²(x) ≡ 1
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Sine rule
a / sin(A) = b / sin(B) = c / sin(C)
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Two answers by sine rule
A and 180-A
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cosine rule
c² = a² + b² - 2abcos(C)
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Area of a triangle
Area = 1/2 absin(C)
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Magnitude of vector a = pi + qj
√p² + q²
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Unit vector
Magnitude is one
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Parallelogram
AB = DC
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Rhombus
|AB| = |BC|
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If vectors a and b are parallel
b = ta
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Displacement from A to B
AB = b-a
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Midpoint of line AB
1/2 (a+b)
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If graph is increasing
Positive gradient
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If graph is decreasing
Negative gradient
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When gradient = 0
Stationary point
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Differentiation from first principles
f’(x) = lim h→0 (f(x+h) - f(x)) / h