답변 :2배각공식은 2sinA=sinA*cosA, 2cosA=cosA^2-sinA^2=1-2sinA^2=2cosA^2-1, 2tanA=2tanA/1-tanA^2 입니다제곱관계sin²θ+cos²θ=1tan²θ+1=sec²θ1+cot²θ
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