How would I simplify this expression:

(1/2)cos(x/2)cosx+sinxsin(x/2)

I can't find the identity to simplify.

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- Oct 15th 2012, 05:45 PMMajMinorMore trig simplification
How would I simplify this expression:

(1/2)cos(x/2)cosx+sinxsin(x/2)

I can't find the identity to simplify. - Oct 15th 2012, 05:55 PMMarkFLRe: More trig simplification
Is it:

? - Oct 15th 2012, 05:58 PMMajMinorRe: More trig simplification
No, it's:

(1/2)[cos(x/2)cosx]+sinxsin(x/2) - Oct 15th 2012, 06:07 PMMarkFLRe: More trig simplification
Okay, I just wanted to be sure. I would look at product-to-sum identities.