let tan x = tDifferentiating on both sides we get,sec2 x dx = dtSubstituting above equation in ∫tan3x sec2x dx we get,= ∫t3 dt

Q4 of 865 Page 19

Write a value of

let tan x = t

Differentiating on both sides we get,

sec² x dx = dt

Substituting above equation in ∫tan³x sec²x dx we get,

= ∫t³ dt

Write a value of