given that x=(Sin(2/5))^(-1),find the exact value of 1.(Cosx)^2 2.(Tanx)^2
人气：316 ℃ 时间：2020-03-22 17:16:04
解答
1.(Cosx)^2
=19/25
2.(Tanx)^2
=4/19
用
(sinx)^2+(cosx)^2=1
来算
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