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If x=a cos ^(3) theta, y=b sin ^(3)theta...

If `x=a cos ^(3) theta, y=b sin ^(3)theta,` then

A

`x cos theta - y sin theta =a cos 2 theta`

B

`x cos theta + y sin theta =a cos 2 theta `

C

`x sin theta + y cos theta = a cos 2 theta `

D

None of these

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The correct Answer is:
A
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