
己知tanθ=2求sinθcosθ的值(求多种方法)

结 论: 对于sinα与tanα,角度越大,函数值也越大; 对于cosα,角度越

文档下载 所有分类 > @的正余弦值表cos@的值 1 2 3 4 5 6 7 8 9 10
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己知cosθ=-3/5,且θ∈(兀,3/2兀),求cosθ/2的值
图片内容是:cos150°的值
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若tanα=3,则sinαcosα的值为多少
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cos15度的值是?

已知sin(π α)=4/5,α∈(-2/π,0),求cosα的值
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cos150度等于多少
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cos(2兀/3)的值