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 ...

We get this value by pressing 15, then the × button, then the sin button on the calculator ... We therefore select the equation for cos as it contains both these terms. \({cos~θ} ...