Thus, if we know one anti derivative F of a function f, we can write
down an infinite number of anti derivatives of f by adding any constant to F
expressed by F(x)  + C, C ∈ R In applications, it is often necessary to satisfy an
additional condition which then determines a specific value of C giving unique
anti derivative of the given function (ii)
Sometimes, F is not expressible in terms of elementary functions viz , polynomial,
logarithmic, exponential, trigonometric functions and their inverses etc