Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Sbdenney

  • 3 years ago

Let sin A = 12/13 with 90º≤A≤180º and tan B = -4/3 with 270º≤B≤360º. Find tan (A + B). I need help PLEASE

  • This Question is Closed
  1. Sbdenney
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I need the fraction

  2. Sbdenney
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ? PLEASE!

  3. myininaya
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \[\tan(A+B)=\frac{\sin(A+B)}{\cos(A+B)}=\frac{\sin(A)\cos(B)+\sin(B)\cos(A)}{\cos(A)\cos(B)-\sin(A)\sin(B)}\] So we need to know the following: sin(A);sin(B);cos(A);cos(B) |dw:1323414397246:dw|

  4. myininaya
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    we have two right triangles: we need to use Pythagorean thm twice

  5. myininaya
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1323414566260:dw|

  6. myininaya
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    sin(A)=12/13;sin(B)=-3/5;cos(A)=-5/13;cos(B)=4/5

  7. myininaya
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so plug this into what I gave you above

  8. myininaya
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \[\tan(A+B)=\frac{\sin(A+B)}{\cos(A+B)}=\frac{\sin(A)\cos(B)+\sin(B)\cos(A)}{\cos(A)\cos(B)-\sin(A)\sin(B)} \]

  9. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.