10 - trig identities

where should u go to find most notes for trig identities, inc astc graphs

year 11 further maths notes!!!

sin(x), cos(x), tan(x) relationship

sin(x)/cos(x) = tan(x)

where does sin(x)/cos(x) = tan(x) come from

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unit triangle

right angled triangle with hypotenuse 1 and theta next to the right angle (not above it)

unit triangle opposite and adjacent

opposite = sin(x) x hyp = sin(x) x 1 = sin(x)

adjacent = cos(x) x hyp = cos(x) x 1 = cos(x)

unit triangle hypotenuse gradient

gradient = rise/run = sin(x)/cos(x) = tan(x)

relationship btw sin²(x) and cos²(x)

sin²(x) + cos²(x) = 1

where does the relationship btw sin²(x) and cos²(x) come from

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how to solve trig proof questions

manipulate one side (eg. LHS) until it matches the other side (RHS)