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sin(-5π/12)是多少
人气:449 ℃ 时间:2020-09-21 09:37:32
解答
sin(-5π/12)
=-sin(5π/12)
=-sin(π/6+π/4)
=-sin(π/6)cos(π/4)-cos(π/6)sin(π/4)
=-(根2+根6)/4
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