Q. 34.3( 307 Votes )

Evaluate:
(i)
(ii) Sin 25° Cos 65° + Cos 25° Sin 65°

Answer :

(i)

(ii) sin 25°cos 65°+ cos 25°sin 65°

= sin 25° cos (90°-25°) + cos 25°sin 65°
= sin 25°sin 25° + cos 25°sin 65°
= sin2 25° + cos 25° sin (90°-25°)

= sin2 25° + cos2 25°

=1

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