Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

catgirl17

  • 2 years ago

evaluate the expression without using a calculator. sin 30 cos 60 + sin 60 cos 30

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

    sin 30 cos 60 + sin 60 cos 30 Sin 30 = 1/2 cos 60 = 1/2 sin 60 = sqrt(3)/2 cos 30 = sqrt(3)/2 ((1/2)(1/2)) + (sqrt(3)/2)^2 (1/4)+ (sqrt(3)/2)^2

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

    so would that be the answer?

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

    instead u can use sinA cos B +cos A sinB = sin (A+B) so your expression is sin (30+60) = sin 90 = 1

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

    @franciscanmonk is that my answer?

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

    @catgirl17 Learn the formula! @franciscanmonk it's great review for you :)

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

    haha. yeah i thought there was a way to simplify that. and i couldnt get a hold of it.

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

    did u get that formula ? @catgirl17 and yes final answer is 1.

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

    yes

  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.