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sEC 2x的二阶导数

y=sec2x y'=sec2x*tan2x*2=2sec2xtan2x y''=2(sec2x)'tan2x+2sec2x(tan2x)' =2sec2xtan2x*2tan2x+2sec2x*sex^2x*2 =4tan^2 2xsec2x+4sec^32x =4(sec^2 2x-1)sec2x+4sec^3 2x =8sec^3 2x-4sec2x.

简要步骤如上。

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y = tan(x+y)..............................................................(1) y' = sec²(x+y) (1+y')..................................................(2) y'{1-sec²(x+y)} = sec²(x+y) y' = sec²(x+y)/{1-sec²...

你要求什么?dy/dx? 1*dy/dx= sec²(x+y) *(dy/dx+1) dy/dx(1-sec²(x+y))=sec²(x+y) dy/dx(-tan²(x+y))=sec²(x+y) dy/dx=-(1+tan²(x+y))/tan²(x+y) dy/dx=-cot²(x+y)-1 d²y/dx²=cot(x+y)csc(x+...

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