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If sum ( r =1) ^( oo) tan ^(-1) (( 4)/...

If `sum _( r =1) ^( oo) tan ^(-1) (( 4)/( r ^(2) + r + 16)) = tan ^(-1) ((alpha )/( 10)), ` then ` alpha ` is

A

80

B

40

C

20

D

30

Text Solution

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The correct Answer is:
B
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