Find the divergence of U = r cos 0 a, – sin 0 a, + 2r² sin 0 ap. r 2 sin 0 3 sin 0 - r2 None of the choices 2 cos 0 3 cos 0 - r2 2 cos 0 3 cos 0 - r 3 cos(03r2) 2 cos 0 r2 r2

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