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If x,y,z are in A.P. and tan^(-1)x , tan...

If x,y,z are in A.P. and `tan^(-1)x , tan^(-1)y ` and `tan^(-1) z` are also in A.P., then `:`

A

x=y=z

B

x=y = - a

C

x=1,y=2,z=3

D

x=2,y=4,z=6

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The correct Answer is:
A
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