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Question

If y=1(a-z), then dzdy=


A

a-z2

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B

-z-a2

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C

z+a2

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D

-z+a2

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Solution

The correct option is A

a-z2


Explanation for the correct option :

Step 1: Express z in terms of y.

y=1(a-z)⇒ay-yz=1⇒z=a-1y ........ 1

Step 2: Find dzdy

By differentiating 1 w.r.t y, we get

dzdy=ddya-1y=0+1y2=11a-z2=a-z2

Hence, option A is correct.


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