若α为第二象限角
那么sinα>0,cosα
若α为第二象限角,则点P(sinα,cosα)是第几象限内的点
若α为第二象限角,则点P(sinα,cosα)是第几象限内的点
数学人气:995 ℃时间:2020-02-03 19:19:22
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