Answers

2015-08-15T20:21:59+08:00
2015-08-16T13:41:02+08:00
First we evaluate the cosine of each angle A and B: cosA = 3/5 and cosB = 24/25 (You can find 3 and 24 using pythagorean triples). Then , we use the formula: sin(A+B) = sinAcosB + sinBcosA --> sin(A+B) = (4/5)(24/25) + (7/25)(3/5) = 96/125 + 21/125 = 117/125
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