how sin 53- cos 37 = sin 53- cos(90-53) becomes 53 - 53
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sin 53 -cos 37
= sin 53 - cos (90-53)
= sin 53 - sin 53
=0 since cos (90-x) = sin x
= sin 53 - cos (90-53)
= sin 53 - sin 53
=0 since cos (90-x) = sin x
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