\(\frac{d}{{dx}}({\cos ^{ - 1}}3x) = :\)

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4 + 14 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

\(\frac{d}{{dx}}({\cos ^{ - 1}}3x) = :\)

\(\frac{{ - 1}}{{\sqrt {1 - 9{x^2}} }}\)

\(\frac{3}{{\sqrt {1 - 9{x^2}} }}\)

\(\frac{{ - 3}}{{\sqrt {1 - 9{x^2}} }}\)

\(\frac{1}{{\sqrt {1 - 9{x^2}} }}\)