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Hannah_Ahn
 4 years ago
prove
1+sin2x=(sinx=cosx)^2
Hannah_Ahn
 4 years ago
prove 1+sin2x=(sinx=cosx)^2

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Zarkon
 4 years ago
Best ResponseYou've already chosen the best response.4got a lot of equal signs there ;)

Zarkon
 4 years ago
Best ResponseYou've already chosen the best response.4for \[1+\sin(2x)=(\sin(x)+\cos(x))^2\] use \[\sin(2x)=2\sin(x)\cos(x)\] and \[\sin^2(x)+\cos^2(x)=1\]

Will!
 4 years ago
Best ResponseYou've already chosen the best response.1\[(\sin x + \cos x)^2 = \sin^2 x + 2(\sin x \cos x) + \cos^2 x\]

Hannah_Ahn
 4 years ago
Best ResponseYou've already chosen the best response.0zarkon: haha thanks for noticing that ;) and....? is that it?

Will!
 4 years ago
Best ResponseYou've already chosen the best response.1Nah you still have to work it out, just fit the pieces together lol

Zarkon
 4 years ago
Best ResponseYou've already chosen the best response.4combine the work Will! and I did.

Zarkon
 4 years ago
Best ResponseYou've already chosen the best response.4\[(\sin x + \cos x)^2 = \sin^2 x + 2(\sin x \cos x) + \cos^2 x\] \[= \sin^2 x + \cos^2 x +2\sin x \cos x=\cdots\]

Zarkon
 4 years ago
Best ResponseYou've already chosen the best response.4now use what I told you to use. :)

Hannah_Ahn
 4 years ago
Best ResponseYou've already chosen the best response.0aha! solved! :) gracias :)
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