Find the direction angles of the given vector. Write the vector in terms of its magnitude and direction cosines as v = |v|| [ (cos a)i + (cos B)j + (cos y)k ]. v = - 3i - 12j + 4k a = degrees (Round to the nearest tenth of a degree, if necessary.) B =degrees (Round to the nearest tenth of a degree, if necessary.) . y = degrees (Round to the nearest tenth of a degree, if necessary.) v= [ (cos ) i+ cos ()i+ cos () k ] (Simplify your answers. Type an exact value for v|, using fractions and radicals as needed. Round each angle measure to the nearest tenth of a deg Question Viewer