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The area of a circle is given by A=pi r^...

The area of a circle is given by A=`pi r^2`, where r is the radius. Calculate the rate of increase of area with respect to radius.

Text Solution

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`veca =3veci+4vecj-6veck`
`vecb=2veci+5vecj+3veck `
`veca.vecb =3.2+4.5+(-6).3`
`=6+20-18`
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