r 2 = b 2 cos 2 θ এর কার্তেসীয় সমীকরণ নিম্নের কোনটি?
x 2 + y 2 = b 2 ( x 2 − y 2 )
x 2 − y 2 = b 2 ( x 2 + y 2 )
x 2 + y 2 = b 2 ( x 2 − y 2 )
x 2 − y 2 = b 2 ( x 2 + y 2 )
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