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3 + 0 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

\(\frac{d}{{dx}}({\sinh ^{ - 1}}x)\) is equal to _____:

\(\frac{1}{{\sqrt {1 - {x^2}} }}\)

\(\frac{{ - 1}}{{\sqrt {1 - {x^2}} }}\)

\(\frac{1}{{\sqrt {1 + {x^2}} }}\)

\(\frac{1}{{\sqrt {1 + {x^2}} }}\)