SRMJEE 2018 Paper with key

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Question : 86 of 147
 
Marks: +1, -0
Suppose the function f(x)−f(2x) has the derivative 5‌at‌x=1 and derivative 7‌at‌x=2 .The derivative of the function f(x)−f(4x)‌at‌x=1 has the value equal to
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