Vectors and lie in an xy plane. has magnitude 8.40 and angle 132° from the positive direction of the x axis. has components Bx = -8.00 and By = -9.20. (Type 'undefined' for any answer if appropriate.) (a) What is 9 · ? (b) What is 4 3 in unit-vector notation? (c) What is 4 3 in magnitude-angle notation with spherical coordinates? r= ?= (d) What is the angle between the directions of and 4 3? (Hint: Think a bit before you resort to a calculation.) (e) What is + 8.00 in unit-vector notation? (f) What is + 8.00 in magnitude-angle notation with spherical coordinates?