cos105度等于几分之几
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cos105度等于几分之几
cos105度等于几分之几
cos105度等于几分之几
cos105
=cos(45+60)
=cos45cos60-sin45sin60
=√2/2x1/2-√2/2x√3/2
=(√2-√6)/4
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-0.258819 接近-1/4