# Use standard identities to express

by menco
Tags: express, identities, standard
 P: 42 1. The problem statement, all variables and given/known data Use standard identities to express sin(x+pi/3) in terms of sin x and cos x 2. Relevant equations sin(a+b)=sinAcosB+sinBcosA 3. The attempt at a solution sin(x)cos(pi/3)+sin(pi/3)cos(x) 0.5sinx + 0.8660cosx I'm just not sure if i need to simplify it even further and hopefully I'm on the right track. Thanks
 HW Helper P: 6,207 That should be fine. I would just express 0.866 as √3/2 as that is an exact value whilst 0.866 is just an approximation.
 P: 18 that seems right to me. However I'd keep sin(π/3) as $\frac{\sqrt{3}}{2}$. Edit: I didn't see rock.freak667's reply.
P: 42

## Use standard identities to express

thanks for the response :)

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