Pre-Calc help NOW PLEASE!!!

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Evaluate the expression under the given conditions.

tan(A+B); cosA=-1/7, A in quadrant 3, sinB=1/2, B in quadrant 2.

  • Pre-Calc help NOW PLEASE!!! -

    in Q3, tan is positive, so tanA = √48
    in Q2, tan is negative, so tanB = -1/√3

    Now apply the addition formula

    tan(A+B) = (tanA+tanB)/(1-tanA tanB)

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