Find the derivative of the following functions from first principle:
(-x)-1
Let f(x) = (–x)-1 = -1/x. Accordingly, 
By first principle,
= 
= 
= 
= 1/x2
1
Find the derivative of the following functions from first principle:
(-x)-1
Let f(x) = (–x)-1 = -1/x. Accordingly,
By first principle,
=
=
=
= 1/x2