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The Rules of Differentiation

Constant Rule

If f(x)=af(x)=a and aa is a real number, then

f(x)=0f'(x)=0.

Constant Multiple Rule

If f(x)=axf(x)=ax and aa is a real number, then

f(x)=af'(x)=a

Power Rule

If f(x)=xnf(x)=x^n and nn is a real number, then

f(x)=nxn1f'(x)=nx^{n-1}.

Product Rule

If ff and gg are differentiable at xx, then

(fg)(x)=f(x)g(x)+g(x)f(x)(f*g)'(x)=f(x)g'(x)+g(x)f'(x)

Quotient Rule

If ff is the quotient g(x)h(x)\dfrac{g(x)}{h(x)} and h(x)0h(x)≠0, then

f(x)=g(x)h(x)g(x)h(x)[h(x)]2f'(x)=\dfrac{g'(x)h(x)-g(x)h'(x)}{[h(x)]^2}

Chain Rule

If gg is differentiable at xx and ff is differentiable at g(x)g(x), then

(fg)(x)=f(g(x))g(x)(f\circ{g})'(x)=f'(g(x))g'(x)

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