JEE Main 20248 Apr, Morning shiftMathematicsMediumLimit, Continuity and Differentiability420× since 2002
The value of \lim _\limits{x \rightarrow 0} 2\left(\frac{1-\cos x \sqrt{\cos 2 x} \sqrt[3]{\cos 3 x} \ldots \ldots . \sqrt[10]{\cos 10 x}}{x^2}\right) is __________.