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Equation of tangent to the curve x=a. e^...

Equation of tangent to the curve `x=a. e^(-y//b)` , at the point where it cuts the X-axis, is

A

`ay+bx=0`

B

`ay+bx=1`

C

`ay+bx=2ab`

D

`ay+bx=ab`

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The correct Answer is:
D
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