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化简cos(π/4-α)²+cos(π/4+α)²
人气:160 ℃ 时间:2020-02-05 22:41:52
解答
;cos(π/4-α)²+cos(π/4+α)²=cos(π/4-α)²+sin【π/2-(π/4+α)】²=cos(π/4-α)²+sin(π/4-α)²=1
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