यदि x= (2cos theta -cos 2theta ) व y= ...

यदि `x= (2cos theta -cos 2theta ) ` व ` y= (2sin theta - sin 2theta )` तब ` theta =(pi)/(2 )` पर ` (d^(2)y)/(dx^(2))` का मान ज्ञात कीजिए |

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