Prove that [sin x + cos x]^2 = 1 + sin 2x

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- Nov 26th 2008, 02:24 PMManizzleHelp proving this expression is equal..
Prove that [sin x + cos x]^2 = 1 + sin 2x

- Nov 26th 2008, 03:36 PMskeeter
- Nov 26th 2008, 05:13 PMvincisonfire
If that's not what he means then his book must be wrong.

- Nov 26th 2008, 06:50 PMManizzle
yes i'm sorry thats what i meant, my superscript didn't work with the font i had on here sorry guys

- Nov 27th 2008, 04:33 AMskeeter

square the left side ...

rearrange a bit ...

now, you should know what the sum of the first two terms is ... also, look up the double angle formula for sine to deal with the last term.