Problem

Find all solutions to the equation $11 \cos x=\frac{1}{\cos x}$ for $0 \leq x \leq 2 \pi$. Enter your answers in increasing order, rounded to three decimal places.

Solution

Step 1 :Given the equation \(11 \cos x=\frac{1}{\cos x}\). This can be rewritten as \(11 \cos^2 x = 1\).

Step 2 :Solving for \(\cos x\), we get \(\cos x = \pm \frac{1}{\sqrt{11}}\).

Step 3 :We need to find the values of \(x\) in the interval \([0, 2\pi]\) that satisfy this equation.

Step 4 :The solutions to the equation are approximately \(x = 1.265, 1.877, 4.406, 5.019\).

Step 5 :Final Answer: The solutions to the equation \(11 \cos x=\frac{1}{\cos x}\) for \(0 \leq x \leq 2 \pi\) are \(\boxed{1.265, 1.877, 4.406, 5.019}\).

From Solvely APP
Source: https://solvelyapp.com/problems/7706/

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