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삼각함수 공식
- csc θ=1sin θ
- sec θ=1cos θ
- tan θ=sin θcos θ
- cot θ=cos θsin θ
- cot θ=1tan θ
- sin2θ+cos2θ=1
- 1+tan2θ=sec2θ
- 1+cot2θ=csc2θ
- sin(−θ)=−sin θ
- cos(−θ)=cos θ
- tan(−θ)=−tan θ
- sin(π2−θ)=cos θ
- cos(π2−θ)=sin θ
- tan(π2−θ)=cot θ
- sin(x+y)=sin x cos y+cos x sin y
- sin(x−y)=sin x cos y−cos x sin y
- cos(x+y)=cos x cos y−sin x sin y
- cos(x−y)=cos x cos y+sin x sin y
- tan(x+y)=tan x+tan y1−tan x tan y
- tan(x−y)=tan x−tan y1+tan x tan y
- sin 2x=2sin x cos x
- cos 2x=cos2x−sin2x=2cos2x−1=1−2sin2x
- tan 2x=2tan x1−tan2x