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求值:sin4派/3×cos25派/6×tan(-3派/4)
人气:406 ℃ 时间:2020-08-02 14:08:56
解答
原式=sin(π+π/3)Xcos(4π+π/6)Xtan(π/4-π)
=(-1)sinπ/3Xcosπ/6Xtanπ/4
=-√3/2X√3/2X1
=-3/4
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