Evaluate:
To find:
Formula used:
1. sec2 x = 1 + tan2x
2.
Dividing by cos4 x in the numerator and denominator of the given equation,
Let y = tan x
dy = sec2 x dx
Substituting in the original equation,
Dividing by y2 in the numerator and denominator,
Let
Therefore,
Substituting for z,
Substituting for y = tan x,
Therefore,