Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

catgirl17

evaluate the expression without using a calculator. (cos 30)^2 - (sin 30)^2

  • one year ago
  • one year ago

  • This Question is Closed
  1. psi9epsilon
    Best Response
    You've already chosen the best response.
    Medals 0

    is 30 in radians or degrees

    • one year ago
  2. catgirl17
    Best Response
    You've already chosen the best response.
    Medals 0

    degress

    • one year ago
  3. catgirl17
    Best Response
    You've already chosen the best response.
    Medals 0

    degrees

    • one year ago
  4. psi9epsilon
    Best Response
    You've already chosen the best response.
    Medals 0

    use double angle formulas\[\cos (30)^2-\sin(30)^2=\cos(2*30)=\cos(60)=0.5\]

    • one year ago
  5. psi9epsilon
    Best Response
    You've already chosen the best response.
    Medals 0

    does that help

    • one year ago
  6. catgirl17
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

    • one year ago
    • Attachments:

See more questions >>>

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.