Question: 15) If z = 2x2y + 31}' where 1 = 12 + 2rs and y 2r - 45, then by means of the chain

15) If z = 2x2y + 31}' where 1 = 12 +

2rs and y 2r - 45, then by means of the chain

15) If z = 2x2y + 31}' where 1 = 12 + 2rs and y 2r - 45, then by means of the chain rule, (a) find g; (b) evaluate when r 1 and s = O. as 15)

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