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(tan^2α-cot^2α)/(sin^2α-cos^2α)=sec^2α•csc^2α
人气:180 ℃ 时间:2020-04-15 06:40:31
解答
(tan²α-cot²α)/(sin²α-cos²α)=(sin²α/cos²α-cos²α/sin²α)/(sin²α-cos²α)=(sin⁴α-cos⁴α)/[sin²αcos²α(sin²α-cos²...
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