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If x cos theta + y sin theta = a , x si...

If ` x cos theta + y sin theta = a , x sin theta - y cos theta = b ` then

A

`a^(2)+b^(2) = x^(2)+y^(2) `

B

`x^(2)//a^2 + y^(2)//b^(2) =2 `

C

xy=ab

D

none

Text Solution

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The correct Answer is:
A
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