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2sin^230度×tan30度+cos60度×cot30度的值为
人气:271 ℃ 时间:2020-05-22 17:28:41
解答
2sin^230°×tan30°+cos60°×cot30°
=(1-cos60°)×tan30°+cos60°×cot30°
=(1-sin30°)×tan30°+cos60°×(cos30°/sin30°)
=(1-sin30°)×tan30°+cos30°
=1/2×√3/3+√3/2=2√3/3
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