각변환

삼각함수 각변환 공식       1. sin함수 1) sin(±θ)=±sinθ 2) sin(π/2±θ)=cosθ 3) sin(π±θ)=∓sinθ 4) sin(3π/2±θ)=-cosθ 5) sin(2π±θ)=±sinθ   2. cos함수 1) cos(±θ)=cosθ 2) cos(π/2±θ)=∓sinθ 3) cos(π±θ)=-cosθ 4) cos(3π/2±θ)=±sinθ 5) cos(2π±θ)=cosθ   3. tan함수 1) tan(±θ)=±tanθ 2) tan(π/2±θ)=∓1/tanθ 3) tan(π±θ)=±tanθ 4) tan(3π/2±θ)=∓1/tanθ 5) tan(2π±θ)=±tanθ