Question

cos 38° cos 52°- sin 38° sin 52°=0

Answer 1

cos 38 cos 52 - sin38 sin 52
=cos(52+38)
= cos (90)
=0

Answer 2

We change cos38° into sin 52
and Sin38° into cos 52
Therefore,
Sin52Cos52 - Cos52 sin 52
=0

hopefully it helps

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