sin²10°+sin²20°+sin²30°+……+sin²80°
=cos²80°+cos²70°+cos²60°+cos²50°+sin²50°+sin²60°+sin²70°+sin²80°
=cos²80°+sin²80°+cos²70°+sin²70°+cos²60°+sin²60°+cos²50°+sin²50°
=1+1+1+1
=4
sin²10°+sin²20°+sin²30°+……+sin²80°=?
sin²10°+sin²20°+sin²30°+……+sin²80°=?
數(shù)學(xué)人氣：292 ℃時(shí)間：2020-06-25 10:20:29
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