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Find the equation of sphere if it touch...

Find the equation of sphere if it touches the plane `rcdot(2hat(i)-2hat(j)-hat(k))=0` and the position vector of its centre is `3hat(i)+6hat(j)-hat(k).`

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The correct Answer is:
`9x^(2)+9y^(2)+9z^(2)-54x-108y+72z+245=0`
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