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计算cos^4(π/8)+sin^4(π/8)=____怎么做的?
人气:490 ℃ 时间:2020-04-12 00:57:56
解答
cos^4(π/8)+sin^4(π/8)
=(cos^2(π/8)+sin^2(π/8))^2-2cos^2(π/8)sin^2(π/8)
=1-0.5sin^2(π/4)
=3/4
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