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OpenStudy (anonymous):
Write the expression as a product: sin 9x - sin 5x
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mathslover (mathslover):
what is \(\large{sin A - sin B}\) ?
mathslover (mathslover):
sin A − sin B = 2 sin ½ (A − B) cos ½ (A + B)
mathslover (mathslover):
@cgarnett please reply ... m i correct?
OpenStudy (anonymous):
That should be correct.
mathslover (mathslover):
ok so put A = 9x and B = 5x
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mathslover (mathslover):
what do you get by putting that in formula given above?
mathslover (mathslover):
@cgarnett ?
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