Evaluate the following integrals:
and 
= 
We know 1 + cos 2t = 2cos2t and 1-2cos2t = 2sin2t
Hence, 
Therefore , 
= 
Put 
= 
3
Evaluate the following integrals:
and
=
We know 1 + cos 2t = 2cos2t and 1-2cos2t = 2sin2t
Hence,
Therefore , =
Put
=