∫sec^4x dx ∫sec^2x tan^2x dx

问题描述:

∫sec^4x dx ∫sec^2x tan^2x dx

sec^4x =sec^2x *(1/cos^2x )=sec^2x *tan^2x *(1/sin^2x )=sec^2x *tan^2x *csc^2x
所以原题∫sec^4x dx =∫sec^2x tan^2x *csc^2x dx