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PQ is a common chord of two circles. APB...

PQ is a common chord of two circles. APB is a secant line joining points A and B on the two circles. Two tangents AC and BC are drawn. If `/_ACB = 45^@`, then what is `/_AQB ` equal to ?

A

`75^@`

B

`90^@`

C

`120^@`

D

`135^@`

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