Evaluate the following integrals
Let
Using sin 2x =2 sin x cos x, we get
Let tan x=t
⇒ sec2xdx=dt.
Also, when x=0, t=0
and when , t=∞.
Hence,
Let x2=t
⇒ 2xdx=dt.
and when x=∞, t=∞.