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JEE Advanced Mathematics question

MathematicsApplication of DerivativesJEE Advanced

The function increases if

Answer: (B)

Solution

f'(x) = 4 x x - 4 x x = 4 x x( x - x) = -2 2x 2x = - 4x .

(Equivalently .)

increases where , i.e. or (in one period ), i.e.

< x <

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Question ID VK-109422