## Question

###### Use the Substitution Formula in Theorem 7 to evaluate the integrals in Exercises $1-46$. $$\int_{2 / \sqrt{3}}^{2} \frac{\cos \left(\sec ^{-1} x\right) d x}{x \sqrt{x^{2}-1}}$$

Use the Substitution Formula in Theorem 7 to evaluate the integrals in Exercises $1-46$. $$\int_{2 / \sqrt{3}}^{2} \frac{\cos \left(\sec ^{-1} x\right) d x}{x \sqrt{x^{2}-1}}$$

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