More trigonometry for P2

Identities to memorise for the exam

TANGENT tanθ = sinθ / cosθ COSECANT cosecθ = 1/sinθ SECANT secθ = 1/cosθ COTANGENT cotθ = 1/tanθ

SIN^2 sin^2θ + cos^2θ = 1 COSEC^2 cosec^2θ = 1 + cot^2θ SEC^2 sec^2θ = 1 + tan^2θ COT^2 cot^2θ = cosec^2θ −1

SCI sin^2θ + cos^2θ = 1 ICC 1 + cot^2θ = cosec^2θ ITS 1 + tan^2θ = sec^2θ

Identities in the formula book

sin(A ± B) ≡ sinAcosB ± cosAsinB

cos(A ± B) ≡ cosAcosB sinAsinB

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