hi i have problem understanding the proof of fundamental theorem of calculus. this is part of general proof process using extreme value.
briefly this above saying that the derivate of integral is getting closed to f(x). But what i don't understand is that the unit of result of integral is area, so as h approaches 0, the integral result should be Zero ((f(x+h)-f(x))*0 = 0), not f(x) as in proof.
Hope somebody help me for this.