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ABCD is a cyclic quadrilateral whose dia...

ABCD is a cyclic quadrilateral whose diagonals intersect each other at point O. If `angleCAB=25^(@)` and `angleBCD=85^(@)` then find `angleCBD`.

A

`60^(@)`

B

`70^(@)`

C

`80^(@)`

D

`85^(@)`

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