14.Find the domain of function: root of cos(cosx)

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∣ ∣ ∣ ∣ \begin{matrix} sin x & cos x & cos x cos x & sin x & cos x cos x & cos x & sin x \end{matrix} ∣ ∣ ∣ ∣ = 0,

- \frac{π}{4} \leq x \leq \frac{π}{4}

y = \sqrt{x^{2} - x - 20} + \frac{1}{\sqrt{x^{2} - 5 x - 14}} .

y = \frac{1}{\sqrt{14 + 5 x - x^{2}}} + \sqrt{x^{2} - x - 20} .

f

f (x) = \sqrt{(2 x)}

cos x cos (x + 2) - {cos}^{2} (x + 1)

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