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Choose the correct option. Justify your choice.
(Sec A + tan A) (1 – sin A) =
= (1 – sin2A)/cosA
= cos A
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°
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]