Which of the following expressions is equivalent to $\sin (22°)$?

Given a point on the unit circle corresponding to an angle $\theta$ measured from the positive x-axis, what is the x-coordinate of the point (x, y)?

Consider the equation $\sin \theta$. If $\theta$ is an angle in Quadrant II, what is the value of $\sin \theta$?

The radius of the unit circle intersects the circle at the point where the angle is $\frac{\pi }{4}$ radians. What is the approximate value of $y$ at this point?

On the unit circle, what is the radian measure of the arc that subtends a central angle of $90°$?

On the unit circle, for $0<\theta <\pi$, when is $tan\left(\theta \right)$ undefined?

Given $x=\sin \frac{\pi }{2}$ and $y=\cos \frac{\pi }{2}$, which of the following is correct for $x$ and $y$ where $0\le \theta \le \pi$?

Given the polar equation $r^2=\sin \left(2\theta \right)$, which of the following best describes the shape of its graph on the unit circle?

Write the complex exponential function $e^{i\theta }$ as a sum of its real and imaginary parts: