If \(y = cos – 1\sqrt{1 – x^2}\) then dy/dx = ?

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

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

0%

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

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

25%

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

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

75%

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

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

0%