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Find the rate of change of the area of a...

Find the rate of change of the area of a circle per second with respect to its radius r when r = 5 cm.

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The correct Answer is:
`10 pi cm^(2)//cm`
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KUMAR PRAKASHAN-APPLICATION OF DERIVATIVES -TEXTBOOK ILLUSTRATIONS FOR PRACTICE WORK
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  8. Show that the function f given by f(x)=x^(3)-3x^(2)+4x, x in R is incr...

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  14. Find the slope of the tangent to the curve y=x^(3)-x at x = 2.

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  15. Find the point at which the tangent to the curve y=sqrt(4x-3)-1 has it...

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  16. Find the equation of all lines having slope 2 and being tangent to the...

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  18. Find the equation of the tangent to the curve y=(x-7)/((x-2)(x-3)) at ...

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  19. Find the equations of the tangent and normal to the curve x^((2)/(3))+...

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