Trigonometry
Find the exact solution of the equation.
7arccos(x5−π5)=7π7\arccos\left(\frac{x}{5}-\frac{\pi}{5}\right)=7\pi7arccos(5x−5π)=7π
x=πx=\pix=π
x=π−5x=\pi-5x=π−5
x=5πx=5\pix=5π
No solution