y=tan^2(1/x) 求导要详解

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y=tan^2(1/x)求导要详解y=tan^2(1/x)求导要详解y=tan^2(1/x)求导要详解y''=e^[tan(1/x)]*[tan(1/x)]''=e^[tan(1/x)]*[sec(1/x

y=tan^2(1/x) 求导要详解
y=tan^2(1/x) 求导要详解

y=tan^2(1/x) 求导要详解
y'=e^[tan(1/x)]*[tan(1/x)]'
=e^[tan(1/x)]*[sec(1/x)]^2*(1/x)'
=-{e^[tan(1/x)]*[sec(1/x)]^2}/x^2