15_5_2 - a d φ and a sin φ d θ Thus dS = a 2 sin φ d φ...

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2. The area element dS is bounded by the curves in which the coordinate planes at θ and θ + d θ and the coordinate cones at φ and φ + d φ intersect the sphere R = a . (See the figure.) The element is rectangular with sides
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Unformatted text preview: a d φ and a sin φ d θ . Thus dS = a 2 sin φ d φ d θ. x y z θ d θ φ d φ d S a a sin φ Fig. 5-2...
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