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If cos 3A +cos 3B+cos 3C=1 then one of t...

If `cos 3A +cos 3B+cos 3C=1` then one of the angles of the triangle ABC is

A

`60^@`

B

`90^@`

C

`120^@`

D

`30^@`

Text Solution

Verified by Experts

The correct Answer is:
c
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