The equation of the normal to the curve ...

The equation of the normal to the curve `(x/a)^4+(y/b)^4 =2` at (a,b) is

A

`x/a+y/b=2`

B

`x/a-y/b=2`

C

`ax+by=a^2+b^2`

D

`ax-by=b^2-a^2`

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The correct Answer is:

D

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