[질문] sin제곱+cos제곱합이1맞나요??삼각함수공식좀알려주세요

sin²θ+cos²θ=1맞습니다.그외에sin(-θ)=-sinθ,cos(-θ)=cosθ,tan(-θ)=-tanθ,sec²θ-tan²θ=1,csc²θ-cot²θ=1sin(π/2-θ)=cosθ,sin(π/2+θ)=cosθ등