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sec(x)的导数=sec(x) tan(x)
人气:485 ℃ 时间:2019-08-26 06:45:23
解答
sec(x)'=(1/cos(x))'
=sin(x)/cos^2(x)
=sin(x)/cos(x) * 1/cos(x)
=tan(x) * sec(x)
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