Posted by Josh on .
Evaluate the expression under the given conditions.
tan(A+B); cosA=1/7, A in quadrant 3, sinB=1/2, B in quadrant 2.

PreCalc help NOW PLEASE!!! 
Steve,
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)/(1tanA tanB)