Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

kdeedee02

  • 2 years ago

Find exact value of the expression find sin (2theta) , when cos(theta) =4/5 and theta lies in quadrant IV

  • This Question is Open
  1. alexjb1007
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    To start with the triangle is a 3,4,5 triangle based on cos theta = 4/5. Secondly the sin (2theta) is equal to 2sin(theta)cos(theta)[double angle identity]. The sin of theta would equal 3/5. So 2(3/5)(4/5) = 24/5.

  2. kdeedee02
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thanx for your help

  3. 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.