Think of the letter xx as four vectors starting from the center and pointing outward. label the four vectors starting from the top left and proceeding clockwise as uu, vv, ww, zz. does uãvuãv point in or out of the page? (in/out) in equation editorequation editor does uãzuãz point in or out of the page? (in/out) out equation editorequation editor compute uãw