# DIFFERENTIABILITY AND CONTINUITY WORKSHEET

(1)  Find the derivatives of the following functions using first principle.

(i) f(x)  =  6

(ii)  f(x)  =  -4x + 7

(iii)  f(x)  =  -x2 + 2

(2)  Find the derivatives from the left and from the right at x = 1 (if they exist) of the following functions. Are the functions differentiable at x = 1?

(i)  f(x)  =  |x - 1|

(ii)  f(x)  =  √(1 - x2)       Solution

Solution

(3)  Determine whether the following function is differentiable at the indicated values.

(i) f(x) = x | x | at x = 0        Solution

(ii)  f(x) = |x2 - 1| at x = 1      Solution

(iii)  f(x) = |x| + |x - 1| at x = 0, 1       Solution

(iv)  f(x)  =  sin |x| at x = 0        Solution

(4)  Show that the following functions are not differentiable at the indicated value of x.

(i)

Solution

(5)  The graph of f is shown below. State with reasons that x values (the numbers), at which f is not differentiable.

(6)  If f(x) = |x + 100| + x2, test whether f'(-100) exists.

Solution

(7)  Examine the differentiability of functions in R by drawing the diagrams.

(i) | sin x |            Solution

(ii)  |cos x|          Solution

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