Trigonometry Identities
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Identities: sin2θ+cos2θ=1 sec2θ- tan2θ=1 csc2θ-cot2θ=1 sinθcosθ=tanθ sinθ=sin(180- θ) cosθ=cos(-θ) -sinθ=sin(-θ) sinθ=cos(90- θ) cosθ=sin(90-θ) cscθ=sec(90- θ) cotθ=tan(90-θ) sinA+B=cosAsinB+cosBsinA sin2θ=2cosθsinθ cosA+B=cosAcosB-sinAsinB cos2θ=-2sin2θ+1 cos2θ=2cos2θ-1 cos2θ=cos2θ-sin2θ tan2θ=2tanθ1-tan2θ Other: a1sinBt+a2sinBt=Asin(Bt+∅) A=a12+a22 and tan∅=a2a1
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