If tanalpha=(1)/(2)and3cosx+4sinx=5, the...

If `tanalpha=(1)/(2)and3cosx+4sinx=5`, then x is equal to

A

(a) `npi+alpha`

B

(b) `2npi+2alpha`

C

(c) `npi+2alpha`

D

(d) `2npi+alpha`

Verified by Experts

The correct Answer is:

B

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