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计算:sin^67.5°-cos^67.5度
人气:137 ℃ 时间:2021-03-04 04:17:51
解答
sin^2(67.5°)-cos^2(67.5°)= -(cos^2(67.5°)-sin^2(67.5°))=-cos(2*67.5°)=-cos135°=√2/2
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