Question: Angle is in quadrant III and angle is in quadrant IV. If sin =-5/6 and cos = 1/2, find cos( + ). Please help. I've

Angle is in quadrant III and angle is in quadrant IV. If sin =-5/6 and cos = 1/2, find cos(+).

Please help. I've done this so many times and I keep getting the wrong answer. I don't know what I'm doing wrong.

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