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About LinkBacksIf sin A=3/5, <A is in quadrant 1, cos B= -5/13, and <B is in quadrant two find:
sin(A+B)
for angle A, sketch a reference triangle in quad I ...Originally Posted by blame_canada100
since, opposite side = 3 , hypotenuse = 5 ... so the adjacent side = 4 ...therefore,
sketch another reference triangle in quad II and use the same procedure to find... remember the side that runs along the x-axis will have a negative value.
finally, sub in your values into the sum identity for sine ...
 = \sin{A}\cos{B} + \cos{A}\sin{B})
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