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JEE Advanced Mathematics question

MathematicsApplication of DerivativesJEE Advanced

Let . Then

Answer: (A),(C)

Solution

f'(x) = - + 42x - 60 = - - 7x + 10) = -6(x-2)(x-5).

So for or , and for .

- (a) : is m.d. ✓ - (b) On and , decreases, so not m.i. on .

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Question ID VK-109447