1. The problem statement, all variables and given/known data Solve for the unit vectors x-hat and y-hat in terms of r-hat and phi-hat. 2. Relevant equations r-hat=cos(phi)x-hat+sin(phi)y-hat phi-hat=cos(phi)y-hat-sin(phi)x-hat, 3. The attempt at a solution I have been working on this for a really long time, and I keep getting a really complicated expression for x-hat, with everything over cos(phi)^2. That seems wrong, and I can't figure out how to solve it from only those two given equations.