since no QIII angles, a is in QIV and b is in QI
sina = -7/25
cosa = 24/25
sinb = -15/17
cosb = -8/17
now just evaluate
sin(a-b) = sina cosb - cosa sinb
Use the given information to evaluate sin (a-b). Exact answers. No decimals.
Sin a = -7/25, cot b = 8/15; neither a nor b are in quadrant III.
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