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In a `triangle ABC`, `angle ABC =2 angle CAB`, If the side BC is extended to D and `angle ACD = 126^@`, then `angle CAB` is:
`triangle ABC` में, `angle ABC = 2 angle CAB`,यदि भुजा BC को D और तक बढ़ाया जाता है और`angle ACD = 126^@`, फिर `angle CAB` =

A

`84^@`

B

`36^@`

C

`42^@`

D

`63^@`

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