Evaluate the following integrals:
Multiply and divide by cosx
⇒ 
⇒
⇒ 
Assume tanx = t
d(tanx) = dt
sec2x dx = dt
Substituting t and dt in above equation we get
⇒ 
⇒ 
⇒ 
But t = tanx
⇒ 2(tanx)1/2 + c.
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