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Two equal sides of an isosceles triangle...

Two equal sides of an isosceles triangle with fixed base 'a' are decreasing at the rate of 9cm/s How fast is the area of the triangle decreasing when the two sides are equal to 'a'.

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BODY BOOKS PUBLICATION-APPLICATION OF DERIVATIVES-EXERCISE
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  3. Two equal sides of an isosceles triangle with fixed base 'a' are decre...

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