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anonymous
 one year ago
express sin 60  sin 20 as a product
Any ideas of how to start it? lol
anonymous
 one year ago
express sin 60  sin 20 as a product Any ideas of how to start it? lol

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welshfella
 one year ago
Best ResponseYou've already chosen the best response.2there are some identities for sums and differences of sines and cosines as products they;ll be up on the web. i think sin A  sin B = 2 sin(A+B) cos(A B)   2 2 but i'm not sure

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I am using a different identity but how would you do it with that identity? @welshfella I am not finding a formula like that either lol

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@welshfella we havent learned those identities in class however

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2mine was wrong its 2 cos (A+B) sin (aB)   2 2

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@welshfella anything else that would work with it?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2well i suppose you can do this sin 40 = sin ( 2*20) = 2 sin 20 cos 20 sin 40  sin 20 = 2 sin 20 cos 20  sin 20 = sin 20 (2 cos 20  1)

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2ohh  im going crazy  its sin 60 !!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0This question I swear XD This is the formula I think is right to use

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2yes  thats the one i mentioned last

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So the way you just did it is how its done?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Is this right how I did it?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2yes put A = 60 and B = 20 and simplify 2 cos (60 + 20) sin (60  20)   2 2
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