# Help me to solve this equation pls

## Homework Statement

i want to find the beta of this equation. i mean beta in one side and all other things next side. it is ok even if you provide the final answer without calculations.

## Homework Equations

-2R*sin($$\beta$$/2)*cos(K-$$\beta$$/2)/sin(K+$$\beta$$)=d

## Answers and Replies

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kuruman
Homework Helper
Gold Member
What have you tried so far?

I suggest that you first expand cos(k-β/2) and sin(k+β) and then use the half-angle trig identities to get rid of β/2 in favor of β.

What have you tried so far?

I suggest that you first expand cos(k-β/2) and sin(k+β) and then use the half-angle trig identities to get rid of β/2 in favor of β.
thanks. i did try to expand it but im zero in maths. please help

kuruman
Homework Helper
Gold Member
I have provided help by telling you what to do, but I am not going to do it for you. You can find the identities you need to do what I suggested in

http://www.sosmath.com/trig/Trig5/trig5/trig5.html

Look under "Sum-difference formulas" and "Double angle formulas." Begin by multiplying both sides of the equation by sin(K+β). If you get stuck, ask for help but show your work.