Prove each of the following identities:
Consider L.H.S. = 
Multiply and divide by (cos θ + 1) + sin θ):
= 
= 
= 
= 
= 
= R.H.S.
Thus, proved.
27
Prove each of the following identities:
Consider L.H.S. =
Multiply and divide by (cos θ + 1) + sin θ):
=
=
=
=
=
= R.H.S.
Thus, proved.