Posted by **Josh** on Wednesday, April 18, 2012 at 3:33pm.

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!!! -
**Steve**, Wednesday, April 18, 2012 at 4:43pm
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)

## Answer This Question

## Related Questions

- Pre-Calc Help - Evaluate the expression under the given conditions. (show work ...
- Pre-Calculus - Evaluate the expression under the given conditions.? show work ...
- Pre-Calc Help!!!!!!!! - Evaluate the expression under the given conditions. sin...
- pre-calc helpppp - Evaluate the expression under the given conditions (show ...
- trig - evaluate the expression under the given conditions tan 2 theta; cos theta...
- Pre Calculus - Determine the quadrant in which a 130° angle lies. a. 4th ...
- Pre-calc help please!!! - 1) tan(sin^-1(5/6)-cos^-1(1/7) 2) tan(è + ); cos...
- math - In which quadrant does the angle Θ lie given that Cos Θ > 0...
- Pre Calculus - Determine the quadrant in which an angle, θ, lies if θ...
- Pre Calculus - Determine the quadrant in which an angle, θ, lies if θ...

More Related Questions