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Q)

$\lim\limits_{x\to 0}\large\frac{x(1+a\cos x)-b\sin x}{x^3}$$=1$ then $a,b$ are

$\begin{array}{1 1}(A)\;\large\frac{1}{2},\frac{-3}{2}&(B)\;\large\frac{5}{2},\frac{3}{2}\\(C)\;\large\frac{-5}{2},\frac{-3}{2}&(D)\;\text{None of these}\end{array}$

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