Cosine and sine of an angle θ are defined to be the x and y-coordinates of the point P on the unit circle with the property that the line from O to P makes and angle θ with the positve x-axis. cos(θ) ...

Vector mathematical illustration of sine curve in graph or chart and unit circle showing the sine graph. Gonometric or goniometric function. The icon in blue color is isolated on a white background.

y = sin (x a) ∘ where a is called the phase angle. This is when the graph of the function has been shifted to the left or right by a degrees.