Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Arhin

  • 3 years ago

prove the identity cos(5x)=16cos^5(x)-20cos^3(x)+5cos(x)

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

    5x=4x+x=2(2x)+x, then use the double angle formula, and sin square + cos square =1 to change form to reach the conclusion

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

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy