3 cos A किसके बराबर है ?...

`3 cos A` किसके बराबर है ?

A

`4 cos^2 A + cos 3 A`

B

`4 cos^3 A - cos 3A`

C

`3 cos^3 A - cos 3A`

D

`3 cos^3 A + cos 3A`

लिखित उत्तर

Verified by Experts

The correct Answer is:

B

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