Limits Continuity And Differentiability

$$ \text { If } f(x)=\left\{\begin{array}{cc} \frac{1-\sin x}{(\pi-2 x)^2} & , \quad \text { if } x \neq \frac{\pi}{2} \\ \lambda, & \text { if } x=\frac{\pi}{2} \end{array}\right. $$

Then \(f(x)\) will be continues function at \(x=\frac{\pi}{2}\), then \(\lambda=\)