Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing

This Question is Closed

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

TuringTest Group TitleBest 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
 2 years ago

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

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

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

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

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

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

TuringTest Group TitleBest ResponseYou've already chosen the best response.0
it's correct
 2 years ago

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
@muhammad9t5 I know the formulas, you don't have to correct me. Thanks, though.
 2 years ago
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
 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.