Solve for x cos(x)=2/pi

$\cos (x) = \frac{2}{π}$

Take the inverse cosine of both sides of the equation to extract $x$ from inside the cosine.

$x = \arccos (\frac{2}{π})$

Simplify the right side.

Evaluate $\arccos (\frac{2}{π})$ .

$x = 0.88068923$

The cosine function is positive in the first and fourth quadrants. To find the second solution, subtract the reference angle from $2 π$ to find the solution in the fourth quadrant.

$x = 2 (3.14159265) - 0.88068923$

Simplify $2 (3.14159265) - 0.88068923$ .

Multiply $2$ by $3.14159265$ .

$x = 6.2831853 - 0.88068923$

Subtract $0.88068923$ from $6.2831853$ .

$x = 5.40249607$

Find the period of $\cos (x)$ .

The period of the function can be calculated using $\frac{2 π}{| b |}$ .

$\frac{2 π}{| b |}$

Replace $b$ with $1$ in the formula for period.

$\frac{2 π}{| 1 |}$

The absolute value is the distance between a number and zero. The distance between $0$ and $1$ is $1$ .

$\frac{2 π}{1}$

Divide $2 π$ by $1$ .

$2 π$

The period of the $\cos (x)$ function is $2 π$ so values will repeat every $2 π$ radians in both directions.

$x = 0.88068923 + 2 π n, 5.40249607 + 2 π n$ , for any integer $n$

Solve for x cos(x)=2/pi

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