Evaluate the following integrals:
We know d(cosx) = sinx, and tan can be written interms of cos and sin
∴
∴ The given equation can be written as
⇒
⇒
Now assume cosx = t
d(cosx) = - dt
sinx dx = - dt
Substitute values of t and dt in above equation
⇒
⇒
⇒
⇒
⇒