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Evaluate : &nbspcot 10^@.cot 20^@. cot 3...

Evaluate :  `cot 10^@.cot 20^@. cot 30^@.cot 40^@......   cot 90^@`

A

1

B

`-1`

C

`sqrt3/2`

D

0

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The correct Answer is:
D
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