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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Is it: $\displaystyle \frac{1}{2}\left(\cos\left(\frac{x}{2} \right)\cos(x)+\sin(x)\sin\left(\frac{x}{2} \right) \right)$ ?
No, it's: (1/2)[cos(x/2)cosx]+sinxsin(x/2)
Okay, I just wanted to be sure. I would look at product-to-sum identities.
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