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Convert:
a) the rectangular (x, y, z) = (2, 1, -2) coordinates to cylindrical coordinates.
b) (, theta, ) = (2, /3, 3/2) coordinates from spherical to cylindrical coordinates.
c) (, theta, z) = (2, 6, -3) from cylindrical to spherical coordinates.
d) = 4cotheta equations to rectangular coordinates.
e) 2 - 5 + 4 = 0 equations to rectangular coordinates.