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cos2θ=√2/3,则cos^4-sin^4的值为
cos2θ=(√2)/3,则cos^4 θ-sin^4 θ的值为________.
人气:368 ℃ 时间:2020-05-09 06:08:05
解答
cos^4 θ-sin^4 θ=[(cosθ)^2+(sinθ)^2][(cosθ)^2-(sinθ)^2]=1*cos2θ=(√2)/3
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