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The length of the transversal common tan...

The length of the transversal common tangent to the circle `x^(2)+y^(2)=1` and `(x-t)^(2)+y^(2)=1` is `sqrt(21)`, then t=

A

`pm2`

B

`pm4`

C

`pm3`

D

`pm5`

Text Solution

Verified by Experts

The correct Answer is:
D
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