Listen NCERT Audio Books - Kitabein Ab Bolengi
Choose the correct option. Justify your choice.
Following is the explanation:
9 sec2 A – 9 tan2 A
= 9 (sec2 A – tan2 A)
= 9 x 1
Express the trigonometric ratios sin A, sec A and tan A in terms of cot A
Write all the other trigonometric ratios of ∠ A in terms of sec A
(ii) Sin 25° Cos 65° + Cos 25° Sin 65°
(Sec A + tan A) (1 – sin A) =
Prove the following identities, where the angles involved are acute angles for which the expressions are defined.
(v) using the identity
(ix) [Hint: Simplify LHS and RHS separately]