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वृत्त `x^(2)+y^(2)=9` को प्रचलिक समीकरण में व्यक्त कीजिए।

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दिया गया समीकरण `x^(2)+y^(2)=9`
`implies x^(2)/9+y^(2)/9=1`
`implies (x/3)^(2)+(y/3)^(2)=1=cos^(2) theta+sin^(2) theta`
`implies x/3=cos theta` तथा `y/3=sin theta`
`:. x=3 cos theta," "y=3 sin theta`, यही वृत्त का अभीष्ट परमितीय समीकरण है।

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