Q2 of 168 Page 30

If, then f’(1) is

As, f(x) =

We know that,

∴ f’(x) =

⇒ f’(x) =

∴ f’(1) =

∴ f’(1) = 5/4

Clearly from above calculation only 1 answer is possible which is 5/4

∴ option (a) is the only correct answer.

If, write the value of f’(x).

Let f(x) = x – [x], x ∈ R, then is

If then

If f(x) = 1 – x + x² – x³ + ….. – x⁹⁹ + x¹⁰⁰, then f’(1) equals