trig

posted by .

find the exact value given that cosA=(1/3) in quad I, sin B=(-1/2) in quad 4, and sin C=(1/4) in quad 2

tan(B+C) ?

At the end of my equation I had (sqrt45/15) over (1-sqrt15/15) , how do I rationalize or did I make an error in calculation

  • trig -

    you should have had tanB = -1/√3 and tanC = -1/√45

    for tan(B+C) I got (-√15 - √3)/(√45 - 1)

    (which is the right answer, because I used my calculator to find the actual angles.)

    we could change the answer to
    (-√15 - √3)/(3√5 - 1) and then multiply top and bottom by (3√5 + 1)/(3√5 + 1) if you have to rationalize it.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    Draw a pair of quadrilaterals where the 1st quad. is congruent to the 2nd quad. No side of one quad. is to be congruent to any other quad Straight out of workbook! PLEASE HELP!!!!!!!!!!!!
  2. Geometry

    Draw a pair of quadrilaterals where the 1st quad. is congruent to the 2nd quad. No side of one quad. is to be congruent to any other quad. Straight out of workbook! PLEASE HELP!!!!!!!!!!!!
  3. Math

    OOPS! Draw a pair of quads. where the angles of the 1st quad. are congruent to the angles of the 2nd quad. No side of one quad. is to be congruent to any side of the other quad. THIS is straight out of the workbook SORRY!
  4. trig

    find the exact value given that cosA=(1/3) in quad I, sin B=(-1/2) in quad 4, and sin C=(1/4) in quad 2 sin(A-B)?
  5. trig

    find the exact value given that cosA=(1/3) in quad I, sin B=(-1/2) in quad 4, and sin C=(1/4) in quad 2 tan(B+C)
  6. Trig

    find (s+t) given that cos s=1/3 with s in quad I and sin T=-1/2 with t in quad IV
  7. Trig

    find the exact value of the expression using the provided information. Find Tan (S+T) given that cos s=1/3 with s in quad I and sin T= -1/2 with T in quad IV
  8. Trig

    find the exact value of the expression using the provided information. Find Tan (S+T) given that cos s=1/3 with s in quad I and sin T= -1/2 with T in quad IV
  9. Trig

    Given sin theta = -3/5 and 0 is in quad 2, find Cos theta and tan theta
  10. Mathematics

    I need help finding the exact value of sin (a + b), given that sin a =3/5 and sin b = 5/13, with a in quad 2 and b in quad 1.

More Similar Questions