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If the chord u=mx +1 of the circel x ^(2...

If the chord `u=mx +1` of the circel `x ^(2) +y^(2)=1` subtends an angle of `45^(@)` at the major segment of the circle, then the value of m is-

A

`pm1`

B

`pm2`

C

`pm3`

D

`pm4`

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The correct Answer is:
A
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