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化简(1+tan^2x)cos^2x
人气:224 ℃ 时间:2020-03-27 15:44:40
解答
(1+tan^2x)cos^2x
=[1+sin^2x/cos^2x]cos^2x
=cos^2x+sin^2x
=1

(1+tan^2x)cos^2x
=sec^2xcos^2x
=1
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