The deriviative of f(x) = x is 1 because the slope of the function f(x) = x is 1.
Recall the slope-intercept form of a line. The equation f(x) = x can also be stated as y = mx+b, where m is 1 and b is 0. The slope is m, or 1, and the deriviative of f(x) is the slope of f(x), which is m or 1, in this case.
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The differentiation of sin x plus cosx is cos (x)-sin(x).
You find the gradient of the curve using differentiation. The answer is 0.07111... (repeating).
f(x)=x/4 + 4/x f'(x) = 1/4 - 4/x^2
x = yy differentiate both sides with respect to x dx = (y * yy-1) dy dy/dx = y * yy-1 dy/dx = yy = x hence differentiate of y wrt x is x only
( u(x+h) - u(x) )/ h