Evaluate the following integrals:
Convert tanx in form of sinx and cosx.
⇒ 
∴ The equation now becomes
⇒ 
⇒ 
⇒ 
Let cosx - sinx = t
∴ 
⇒ - (cosx + sinx)dx =dt
Substituting dt and t
We get
⇒ 
⇒ - ln t + c
t = cosx – sinx
∴ - ln|cosx – sinx| + c
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