
Continuity of a function is defined as the consistency of a function in a given interval. A function is said to be continuous if at no point, the function breaks or varies from other functional values of the given function. The continuity of a function is defined at every point of the function having the same value. This means that for a real valued function to be continuous, the function at every point in its domain should be continuous.
Continuity of a function f(x) at a point ‘a’ is expressed as
limx→a f(x) = f(a)
For example, consider the following function
f(x) = (x + 1)/2 if x is odd
and
f(x) = x/2 if x is even
The function f(x) will be continuous only if it is continuous for both odd and even values of x.
The following conditions are satisfied if a function is continuous:
limx→a- f(x) = lim x→a f(x) = lim x→a+ f(x)
Differentiability of a function at any point is defined there exists the derivative of the given function at that point. Mathematically, differentiability for a function f(x) is
Limx→0 f’(x) = [f(x + h) – f(x)]/h
Where f’(x) is the derivative of f(x). It can also be denoted as d/dx . f(x). The method of obtaining the derivative of a function is called differentiation with respect to a variable. Here, the function f(x) is differentiated with respect to ‘x’.
f(x) = xn
f’(x) = n . xn-1
is the required derivative.(u + v)’ = u’ + v’
(u - v)’ = u’ - v’
(u . v)’ = u’ . v + u . v’
(u/v)’ = [(u’ . v) – (u . v’)]/v²
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