Answer
The statement makes sense.
Work Step by Step
The coordinates of point A, if point A makes an angle $\theta $ with the positive x-axis, will be
$\left( x,y \right)\equiv \left[ OA\cos \theta ,OA\sin \theta \right]$
where O is the origin and OA is the radius of the unit circle.
Since it is a unit circle, the length of OA is equal to 1 unit. Therefore,
$\begin{align}
& \left( x,y \right)\equiv \left[ 1\times \cos \theta ,1\times \sin \theta \right] \\
& \equiv \left[ \cos \theta ,\sin \theta \right]
\end{align}$
Thus, its coordinates define the cosine and sine functions, respectively. Thus, the statement is true.
