f(α)=sin(π-α)*cos(2π-α)/sin(3π/2-α)tanα,则f(-10π/3)等于
2个回答
将原式化简的到f(α)=﹣cosα,
所以f﹙-10π/3﹚=cos(10π/3)=cos(π3+3π)=-cos(π3)=-1/2
选B
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