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数学
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sin75度等于多少
人气:175 ℃ 时间:2020-04-04 07:27:11
解答
sin75=sin(60+15)
cos30=1-2(sin15)^2,这个二倍角公式,知道sin15,就知道cos15,或者
sin75=sin(45+30),这个就更简单了,
或者cos150=1-2(sin75)^2,so many
sin75=0.9397
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