Question Determine $\cos(-405^\circ)$ using the unit circle. Define cosine function from unit circle point $(x, y)$.

Studdy Solution
Therefore, the value of $\cos(-405^\circ)$ is the same as the value of $\cos(315^\circ)$, which is $\frac{\sqrt{2}}{2}$.
The value of $\cos \left(-405^{\circ}\right)$ is $\frac{\sqrt{2}}{2}$.