已知sinθ四次方+cosθ四次方=5/9,求sin2θ的值
人气:480 ℃ 时间:2019-08-20 16:05:16
解答
即(sinθ^2+cosθ^2)^2-2(sinθcosθ)^2=5/9
1-(sin2θ)^2/2=5/9
(sin2θ)^2=8/9
sin2θ=+-2根号2/3
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