Prove each of the following identities:
Consider L.H.S. = 
Multiply and divide by (sec θ + tan θ):
= 
= 
= 
= 
= 
= R.H.S.
Hence, proved.
20
Prove each of the following identities:
Consider L.H.S. =
Multiply and divide by (sec θ + tan θ):
=
=
=
=
=
= R.H.S.
Hence, proved.