Q. 48 D5.0( 2 Votes )

Evaluate the following

cos38° cos52° – sin38° sin 52°

Answer :

We know that

cos θ = sin (90° - θ)


=sin (90° - 38°) sin (90° -52°) – sin 38° sin 52°


= sin 52° sin 38°– sin 38° sin 52°


=0


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