This occurs when \(\cos (x - 0.841) = 1\) so \(x-0.841=\pi ... The roots of the equation are where the graph crosses the \(x\)-close axis. In this instance we can say that the roots occur ...

This circle has the centre at the origin and a radius of 1 unit. The point P can move around the circumference of the circle. At point P the \(x\)-coordinate is \(\cos{\theta}\) and the \(y ...