1.90°
人气:189 ℃ 时间:2019-12-13 16:39:06
解答
2.α 是在第三象限,并且cosα的值在-57.3度到0度范围内所以sin(cosα)是负的、sinα都0到57.3范围内,所以cos(sinα)是正的,所以结果是负的
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