Evaluate the following Integrals:

Let ![]()
Put cos 2θ = x
⇒ –2sin(2θ)dθ = dx (Differentiating both sides)
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When θ = 0, x = cos 0 = 1
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So, the new limits are 1 and
.
Substituting this in the original integral,


Recall ![]()

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