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Evaluate : `intsec^4 x tan x dx.`

Answer» Put sec x =z so, `(d)/(dx) (sec x) = (dz)/(dx) or sec x tan x dx =dx`
`:. Int sec^4 x tan x dx = intsec^3 x (sec x tan x ) dx`
`int x^3 dz = (z^4)/(4) +C = (sec^4 x)/(4) +C = (1)/(4) sec^4 x +c`


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