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数学
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cos(180+A)*sin(A+360)/sin(-A-180)*cos(-180-A)
答案是1还是-1
人气:433 ℃ 时间:2020-03-28 00:47:08
解答
=(-cosA)·sinA / [-sin(-A)]·[-cos(-A)]
=(-cosA)·sinA / sinA·(-cosA)
= 1
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