Find ( 2 f /x 2 ) y , ( 2 f /xy), ( 2 f /yx),

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Find (∂2 f /∂x2)y, (∂2 f /∂x∂y), (∂2 f /∂y∂x), and (∂2 f /∂ y2), for each of the following functions,where a, b, and c are constants
(a) f = (x2 + y2)−1,
(b) f = sin (xy).

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