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AB is a chord to a circle and PAT is the...

AB is a chord to a circle and PAT is the tangent to the circle at A. If `angleBAT =75^@` and `angleBAC = 45^@`, C being a point on the circle, then `angleABC` is equal to___

A

`40^@`

B

`45^@`

C

`60^@`

D

`70^@`

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