सिद्ध कीजिए कि वक्र x= a cos theta + a ...

सिद्ध कीजिए कि वक्र ` x= a cos theta + a theta sin theta - a theta cos theta ` के किसी बिंदु `theta ` पर अभिलंब मूल बिंदु से अचर दुरी पर है |

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