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If sqrt(r ) =ae^(thetacotalpha) where a ...

If `sqrt(r ) =ae^(thetacotalpha)` where a and `alpha` are real numbers then `(d^(2)r)/(d theta^(2))-4rcot^(2)alpha` is

A

r

B

`(1)/(R )`

C

1

D

0

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D
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