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If two waves x1 =A sin (omegat -0.1 x )...

If two waves ` x_1 =A sin (omegat -0.1 x ) and x_2 A sin (omegat -0.1x -phi //2 ) ` are combined with each other ,then resultant amplitude of the combined waves is

A

` 2A cos (phi )/(4) `

B

` A sqrt( 2cos (phi )/( 2))`

C

` 2A cos (phi )/(2)`

D

` A sqrt( ( 1+cos (phi )/( 4))`

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The correct Answer is:
A
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