cos4^θ-sin^4θ 化简
问题描述:
cos4^θ-sin^4θ 化简
高一必修4最好步骤
答
cos4^θ-sin^4θ = (cos²θ-sin²θ)(cos²θ+sin²θ) = cos²θ-sin²θ = cos2θ
cos4^θ-sin^4θ 化简
高一必修4最好步骤
cos4^θ-sin^4θ = (cos²θ-sin²θ)(cos²θ+sin²θ) = cos²θ-sin²θ = cos2θ