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atypical

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## Homework Statement

what is the resultant vector of an isosceles triangle?

## Homework Equations

R^2=a^2+b^2-4abcos(theta)

## The Attempt at a Solution

The books answer R=2acos(theta/2)

Using the formula above, and knowing that a=b in a isosceles triangle I am getting:

R=sqrt[2a^2+2a^2cos(theta)]