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
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⇒ 
Now assume cosx = t
d(cosx) = - dt
sinx dx = - dt
Substitute values of t and dt in above equation
⇒ 
⇒ 
⇒ 
⇒
⇒ 
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