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sin and cos pythagorean identity:
sin²x + cos²x = 1
tan pythagorean identity:
tan²x + 1 = sec²x
csc pythagorean identity:
csc² = cot² + 1
sin(2x) =
2sinxcosx
cos(2x) =
cos²x - sin²x
1 - 2sin²x
2cos²x - 1
tan(2x) =
(2tanx) / (1-tan2x)
vertical line & its slope:
x = c; dne
horizontal line & its slope:
y = c; 0
f(x) = Asin(Bx + C) + K
What are the meanings of the capital variables above?
A = amplitude
2π/B = period
B/C = phase shift (left if +, right if -)
K = vertical shift
domain and range of arcsin:
D: [-1, 1]
R: [-π/2, π/2]
domain and range of arccos:
D: [-1, 1]
R: [0, π]
domain and range of arctan:
D: (− ∞ , ∞ )
R: (-π/2, π/2)
a³ + b³ =
(a+b)(a²-ab+b²)
a³ - b³ =
(a-b)(a²+ab+b²)