# Evaluate the foll

We want to put every term in single entity, so multiply by sin x in numerator and denominator,

Substituting cos x = t, dt = – sin x dx

Now,

Now,

Substitute, t = cos x

OR

Since denominator has sin Φ thus for substitution we can substitute cos Φ = t

Now cos Φ = t

Therefore dt = – sin Φ dΦ

Substitute t = cos Φ

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