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NDA2017MathematicsApplication of DerivativesActual

What is the length of the longest interval in which the function f( x )=3 x -4 ^3 x is increasing?

Options

  1. A3
  2. B2
  3. C3 2

Correct answer

B. 2

Step-by-step solution

f(x)=3 x-4 ^3 x= 3 x 3 x increases in [ - 6 , 6 ] So, interval length = 3

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