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## Homework Statement

Vectors and have scalar product -7.00 and their vector product has magnitude 3.00.

What is the angle between these two vectors?

## Homework Equations

|A| |B| cosθ = -7

|A| |B| sinθ = 3

## The Attempt at a Solution

tanθ = (-3/7)

tan

^{-1}(-3/7)=θ

When I enter tan

^{-1}(-3/7) into my calculator, I get -23.199, but when I enter 23.199 into MasteringPhysics, it tells me that I am incorrect. What am I doing wrong?

Thanks!