Calculate at the point specified if (a) D = (1/z2)[10xyz ax + 5x2z ay + (2z3 – 5x2y) az] at P(–2, 3, 5); (b) D = 5z2 aρ + 10ρz az at P(3, –45°, 5); (c) D = 2r sin ϕ sin ϕ ar + r cos θ sin ϕ aθ + r cos ϕ aϕ at P(3, 45°, –45°).
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