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The equations of two waves given as x = ...

The equations of two waves given as `x = a cos (omega t = delta)` and `y = a cos (omega t + alpha)`, where `delta = alpha + pi/2`, then resultant wave represent:

A

a circle (c.w)

B

A circle (a.c.w)

C

an Ellipse (c.w)

D

an ellipse (a.c.w)

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The correct Answer is:
B
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