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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 with respect to its radius  when r =4 cm .

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RD SHARMA ENGLISH-DERIVATIVES AS A RATE MEASURER -All Questions
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  8. An edge of a variable cube is increasing at the rate of 3 cm per se...

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  9. The radius of a circle is increasing uniformly at the rate of 4 cm/...

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  10. If the area of circle increases at a uniform rate, then prove that the...

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  11. The sides of an equilateral triangle are increasing at the rate of ...

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  12. The radius of a balloon is increasing at the rate of 10 cm/sec. At ...

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  13. A spherical ball of salt is dissolving in water in such a manner that ...

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  14. Find an angle theta , which increases twice as fast as it sine.

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  15. A stone is dropped into a quiet lake and waves move in circles at a...

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  16. differentiate xsinx with respect to x.

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  17. The volume of a cube is increasing at a rate of 9 cm^3/sec . How fast...

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  18. The volume of a cube is increasing at a constant rate. Prove that the ...

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  19. find f ' (x) if f(x) = sinxlogx

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