Answer 启威

7(b) d/dx [sin(lnx)]=cos(lnx)d/dx (lnx)=(cos(lnx))/x
这是普通的微分!!!先微分sin,后微分natural log!就这样吧了!

9.
dy/dx=-2x∙xe^(-x^2 )+e^(-x^2 )
(d^2 y)/(dx^2 )=-2x^2∙(-2x) e^(-x^2 )+(-4x) e^(-x^2 )-2xe^(-x^2 )=e^(-x^2 ) (4x^3-6x)
就只有“保前微后,保后微前”而已!!!

你放轻松点,太紧张,明天会很不好!

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