1+cos^2a/sin^2a=sin^2a/sin^2a+cos^2a/sin^2a
=(sin^2a+cos^2a)/sin^2a
=1/sin^2a.
证明:1+cos^2a/sin^2a=1/sin^2a
证明:1+cos^2a/sin^2a=1/sin^2a
RT
RT
数学人气:508 ℃时间:2020-04-26 21:07:27
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