Let $f(x) = \left\{ \begin{array}{l l} \large\frac{1-\sin^3x}{3\cos^2x}, & \quad if { x < \large\frac{\pi}{2}}\\ a, & \quad if { x = \frac{\pi}{2}} \\ \large\frac{b(1-sin\: x)}{(\pi - 2x)^2}, & \quad if { x > \large\frac{\pi}{2}} \end{array}. \right.$ If f(x) be a continuous function at $x =\large \frac{\pi}{2}$, find a and b.

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