prove that cos 105 + cos 15=sin 75-sin 15
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LHS
cos105 + cos15
=)cos (90+15) + cos (90-75)
=)-sin15+sin75
=)-(sin15-sin75)
=)sin75-sin15
cos105 + cos15
=)cos (90+15) + cos (90-75)
=)-sin15+sin75
=)-(sin15-sin75)
=)sin75-sin15
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