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anonymous
 one year ago
I need explanation...
anonymous
 one year ago
I need explanation...

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1439109817446:dw

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1know the double angle formula? cos 2x = ... ?

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1ok, its good to know all variations of cos 2x formula I will write the 3 most important ones for you \(\Large \cos 2x = \cos^2 x  \sin^2 x\) \(\Large \cos 2x = 2\cos^2 x  1\) \(\Large \cos 2x = 12\sin^2 x \)

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1we need to use the 2nd one for our problem try to get expression for cos^2 x from it

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh alright we are allowed to have a formula page. It says cos^2 x =1+cos2/2

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1exactly, that you'll get from the 2nd formula, just plug that into your integral!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1439110177783:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Alright this wasnt so bad! Thank you :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thanks cant forget the c.
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