Asked by Maddie

If tan y = -4/3 and y is in Q I'VE find cos 2y
Answered by Jennifer
Should this be Q IV (quadrant 4)

tan-1(-4/3) = -53.13 degrees (-53.13 degrees = 360 + -53.13 = 306.87, is in quadrant 4)

Evaluate with your calculator cos(2*306.87)
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