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8 + 4 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

The derivation of \(\sqrt x \) at \(x = a\) is:

\(\frac{1}{{2\sqrt 4 }}\)

\(\frac{1}{{\sqrt a }}\)

\(2\sqrt a \)

\(\frac{{ - 1}}{{2\sqrt a }}\)