Evaluate the definite integral ∫0π/4tan(x)sec2(x)dx\int_{0}^{\pi/4} \tan(x) sec^2(x) dx∫0π/4tan(x)sec2(x)dx using u=tan(x)u = \tan(x)u=tan(x).
1/21/21/2
111
π/4\pi/4π/4
1/41/41/4