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## Homework Statement

Vectors

**A**and

**B**have equal magnitudes of 4.93. If the sum of

**A**and

**B**is the vector 6.79

**j**, determine the angle between

**A**and

**B**

## Homework Equations

c^2 = a^2 + b^2 -2abcos(theta)

## The Attempt at a Solution

I just rearranged the formula above so that I could solve for the angle. I keep getting the same answer (87.0 or 87.1 degrees) but its still wrong. Is it the fact that the sum is 6.79j with j meaning something? I know its a unit vector that indicates direction but I wasn't too sure. Please help!![/B]