∵角α的終邊經(jīng)過點P(-2.-3)
∴可以把角α的對邊看做是-3,鄰邊看做是-2,斜邊看做是√(9+4)=√13
則sinα=-3/√13=-(3√13)/13
cosα=-2/√13=-(2√13)/13
tanα=(-3)/(-2)=3/2
已知角α的終邊經(jīng)過點P(-2.-3)求α的三個三角函數(shù)值
已知角α的終邊經(jīng)過點P(-2.-3)求α的三個三角函數(shù)值
數(shù)學人氣：482 ℃時間：2020-09-17 01:04:14
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