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trig

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If tan y = -4/3 and y is in Q I'VE find cos 2y

  • trig - ,

    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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