If $\alpha$ is the positive root of the equation, $p(x)={x}^{2}-x-2=0$ then $\lim _{x\to {\alpha }^{+}}\frac{\sqrt{1-\cos (p(x))}}{x+\alpha -4}$ is equal to. [JEE Main 2020, 5 Sep (Shift 1)]

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If \(\alpha\) is the positive root of the equation, \(p(x)={x}^{2}-x-2=0\) then \(\lim _{x\to {\alpha }^{+}}\frac{\sqrt{…

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