A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing

This Question is Closed

Tonks
 2 years ago
Best ResponseYou've already chosen the best response.1Start by considering 2A as A+A ... does that make you think of any particular theorem?

TuringTest
 2 years ago
Best ResponseYou've already chosen the best response.0...of course that makes me want to know how to prove the theorem you are thinking of @Tonks

muhammad9t5
 2 years ago
Best ResponseYou've already chosen the best response.0sin(a+a)=sinacosb+cosasinb put the value of a and be here.

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.0We know that sin(2A) = sin(A + A) sin (A + A) = cosA sinA + cosA sinA = 2 sinA cosA QED

Tonks
 2 years ago
Best ResponseYou've already chosen the best response.1@TuringTest try stacking triangles in the unit circle... or is that for cosine?

TuringTest
 2 years ago
Best ResponseYou've already chosen the best response.0I know it was some geometric proof like that, I don't remember those darn things...

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.0Is that enough or do you need proof for sin (A + B) = cosA sinB + cosB sinA

muhammad9t5
 2 years ago
Best ResponseYou've already chosen the best response.0formula you have given is wrong @micahwood50

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.0For proof of sin (A + B) = cosA sinB + cosB sinA: http://en.wikipedia.org/wiki/Proofs_of_trigonometric_identities#Sine

muhammad9t5
 2 years ago
Best ResponseYou've already chosen the best response.0http://upload.wikimedia.org/math/3/e/c/3ec0e99aa364deb052280bcd801fcec2.png

TuringTest
 2 years ago
Best ResponseYou've already chosen the best response.0yep, that's the one...

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.0@muhammad9t5 It's the same. Your point is?

TuringTest
 2 years ago
Best ResponseYou've already chosen the best response.0perhaps you are neglecting the fact that multiplication is commutative muhammad?

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.0dw:1350147756505:dw

muhammad9t5
 2 years ago
Best ResponseYou've already chosen the best response.0ok i got it!! he has just rearranged the places of cos and sin.

TuringTest
 2 years ago
Best ResponseYou've already chosen the best response.0in English that's called the commutative property of addition.

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.0Yeah, sorry about that, though. It's easier for me to remember this formula this way.

muhammad9t5
 2 years ago
Best ResponseYou've already chosen the best response.0@micahwood50 can this destroy the problem of sin(4530) solve with your formula.

muhammad9t5
 2 years ago
Best ResponseYou've already chosen the best response.0cos45*sin30cos45sin30

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.0Well, with minus, it's different story.

muhammad9t5
 2 years ago
Best ResponseYou've already chosen the best response.0ok do sin(45+30)=cos45sin30+cos30sin45

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.0Yeah, I got it. Thanks, though.

muhammad9t5
 2 years ago
Best ResponseYou've already chosen the best response.0bro never mind if i disturb you! Accept just like the game of trig!

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.0@muhammad9t5 I know the formulas, you don't have to correct me. Thanks, though.
Ask your own question
Ask a QuestionFind 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
 Engagement 19 Mad Hatter
 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.