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## Homework Statement

m1v1=m1v1'cosa+m1/2v2'cosB

0=m1v1'sina-(m1v2'sinB/2)

m1v1^2=m1v1'^2+(m1v2'^2)/4

## Homework Equations

The solution in my book is v2'=2v1sqrt(3)

## The Attempt at a Solution

I thought to separate v1' at the firts and put it at the second, but I don't know how to change sin and cos then.