Let f(x)=2\displaystyle {f{{\left({x}\right)}}}={2}. Calculate the following values:
f(a)=\displaystyle {f{{\left({a}\right)}}}=  
f(a+h)=\displaystyle {f{{\left({a}+{h}\right)}}}=  
f(a+h)−f(a)h=\displaystyle {\frac{{{f{{\left({a}+{h}\right)}}}-{f{{\left({a}\right)}}}}}{{{h}}}}=   for h≠0\displaystyle {h}\ne{0}

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