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求值 cos25/3π+tan(-15/4π)
人气:480 ℃ 时间:2020-08-02 15:00:52
解答
cos25/3*π+tan(-15/4*π)
=cos(8+1/3)π+tan(4-1/4)π
=cos(1/3 *π)+tan(-1/4 *π)
=1/2 -1=-1/2
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