SchoolCrop

(Q6)Prove that (
sec A - 1

sec A +1
) = (
1 - cos A

1 + cos A
)

Answer

L.H.S=

sec A - 1

sec A + 1

1

A

- 1

1

A

+1

=

1 - A

A

1 + A

A

=

1 - cos A

1 + cos A

= R.H.S

L.H.S=R.H.S