f(x)=1/x (f(x)-f(a))/(x-a)
I guess its actually calculus. That answer is close, but it's actually -1/(ax)
f(x)-f(a)=1/x-1/a=(a-x)/ax =-(x-a)/ax , dividhng by x-a u get -1/ax
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f(x)-f(a)=1/x-1/a=(a-x)/ax =-(x-a)/ax , dividhng by x-a u get -1/ax