Question

cosine is established as a rotation of a ray formed initially on which axis? (1 point)

the poesitive x-axis

the poesitive y-axis

the negative x-axis

the negative y-axis

Explanation:

In the unit circle definition of trigonometric functions, the cosine function is related to the x - coordinate of a point on the unit circle. The initial ray (the terminal side when the angle is 0 radians or 0 degrees) is along the positive x - axis. When we rotate this ray by an angle \(\theta\), the x - coordinate of the point where the ray intersects the unit circle is given by \(\cos\theta\). So the initial ray for the cosine function (when the angle is 0) is on the positive x - axis.

Answer:

A. the positive x - axis