Evaluate the following integrals:

Assume ![]()
⇒ ![]()
Substituting t and dt we get
⇒ ![]()
⇒ cos2x = ![]()
∴ The given equation becomes,
⇒ ![]()
We know ![]()
⇒ ![]()
⇒ ![]()
But ![]()
⇒
.
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