2.13 In Practice Exercise 2.2, express A in spherical and B in cylindrical coordinates. Evaluate A at (10, π/2, 3π/4) and B at (2, π/6, 1). PRACTICE EXERCISE 2.2 Express the following vectors in Cartesian coordinates: (a) A = pz sin a, 3p cos o a¿ + p cos o sin o a (b) Bra, sin 0 a Answer: (a) A = (b) B= I V² + y 1 [(xyz - 3xy) a, + (zy² + 3x²) a¸ + xy a¸] {[x(x² + y² + z²) - yla, √x² + y² + z² + [y(x² + y² + z²) + x]a, + z(x² + y² + z²)a₂}