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[单选题]
【数学】已知角α的终边上的一点p的坐标(4,-3),则()
A.sinα=4/5
B.sinα=- 3/5
C.osα=- 3/5
D.tanα=- 4/5
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B、sinα=- 3/5
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.sinα=4/5
B.sinα=- 3/5
C.osα=- 3/5
D.tanα=- 4/5
B、sinα=- 3/5
A.当m=-4时,cosβ=4/5,tanβ=3/4
B.当m=4时,cosβ=4/5,tanβ=3/4
C.当m=-4时,cosβ=-4/5,tanβ=-3/4
D.当m=4时,cosβ=-4/5,tanβ=3/4