$\mathop {\lim }\limits_{x \to {\pi \over 2}} {{\cot x - \cos x} \over {{{\left( {\pi - 2x} \right)}^3}}}$ equals

Question

${1 \over {16}}$

${1 \over 8}$

${1 \over {4}}$

${1 \over {24}}$

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