# Thread: Why not use alpha plus beta?

1. ## Why not use alpha plus beta?

Why are they using sin(alpha)+sin(beta) instead of alpha+beta?

2. ## Re: Why not use alpha plus beta?

Hey abhistud.

Hint - If something is a solution then it means that x = alpha and x = beta should give zero on LHS for both equations.

Also note - sin^2(x) + cos^2(x) = 1 and use other trig identities to simplify things.

3. ## Re: Why not use alpha plus beta?

Originally Posted by chiro
Also note - sin^2(x) + cos^2(x) = 1 and use other trig identities to simplify things.
FYI: There is a slight point of clarification to the equation here. The dash is not a negative sign.

-Dan

4. ## Re: Why not use alpha plus beta?

Thanks for that.