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

TuringTestBest 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
 one year ago

muhammad9t5Best ResponseYou've already chosen the best response.0
sin(a+a)=sinacosb+cosasinb put the value of a and be here.
 one year ago

micahwood50Best 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
 one year ago

TonksBest ResponseYou've already chosen the best response.1
@TuringTest try stacking triangles in the unit circle... or is that for cosine?
 one year ago

TuringTestBest ResponseYou've already chosen the best response.0
I know it was some geometric proof like that, I don't remember those darn things...
 one year ago

micahwood50Best ResponseYou've already chosen the best response.0
Is that enough or do you need proof for sin (A + B) = cosA sinB + cosB sinA
 one year ago

muhammad9t5Best ResponseYou've already chosen the best response.0
formula you have given is wrong @micahwood50
 one year ago

micahwood50Best 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
 one year ago

muhammad9t5Best ResponseYou've already chosen the best response.0
http://upload.wikimedia.org/math/3/e/c/3ec0e99aa364deb052280bcd801fcec2.png
 one year ago

TuringTestBest ResponseYou've already chosen the best response.0
yep, that's the one...
 one year ago

micahwood50Best ResponseYou've already chosen the best response.0
@muhammad9t5 It's the same. Your point is?
 one year ago

TuringTestBest ResponseYou've already chosen the best response.0
perhaps you are neglecting the fact that multiplication is commutative muhammad?
 one year ago

micahwood50Best ResponseYou've already chosen the best response.0
dw:1350147756505:dw
 one year ago

muhammad9t5Best ResponseYou've already chosen the best response.0
ok i got it!! he has just rearranged the places of cos and sin.
 one year ago

TuringTestBest ResponseYou've already chosen the best response.0
in English that's called the commutative property of addition.
 one year ago

micahwood50Best ResponseYou've already chosen the best response.0
Yeah, sorry about that, though. It's easier for me to remember this formula this way.
 one year ago

muhammad9t5Best ResponseYou've already chosen the best response.0
@micahwood50 can this destroy the problem of sin(4530) solve with your formula.
 one year ago

muhammad9t5Best ResponseYou've already chosen the best response.0
cos45*sin30cos45sin30
 one year ago

micahwood50Best ResponseYou've already chosen the best response.0
Well, with minus, it's different story.
 one year ago

muhammad9t5Best ResponseYou've already chosen the best response.0
ok do sin(45+30)=cos45sin30+cos30sin45
 one year ago

micahwood50Best ResponseYou've already chosen the best response.0
Yeah, I got it. Thanks, though.
 one year ago

muhammad9t5Best ResponseYou've already chosen the best response.0
bro never mind if i disturb you! Accept just like the game of trig!
 one year ago

micahwood50Best ResponseYou've already chosen the best response.0
@muhammad9t5 I know the formulas, you don't have to correct me. Thanks, though.
 one year ago
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