00:01
Suppose you want to find the derivative of the function using the definition of derivatives.
00:06
And here we have f of x, which is equal to x.
00:09
Rays to the 4th power.
00:11
Now by definition the derivative of f of x is given by f prime of x.
00:16
This is equal to the limit as h approaches zero off f of expose each minus f of x over h.
00:26
Now if f of x is equal to x.
00:29
Rays to the 4th power, then f of exports h.
00:34
This would be expose age race to the 4th power.
00:38
And so we have limits.
00:40
As a jew approaches zero of expose h raised to the fourth power minus x to the fourth power over each.
00:49
And then from here we want to factor out the numerator and we have limit as h approaches zero of x plus h squared minus x squared...