The value of \( \cos 90^\circ \) is \( 0 \).

This is because on the unit circle, at an angle of \( 90^\circ \) (or \( \frac{\pi}{2} \) radians), the point lies at \( (0, 1) \), and cosine corresponds to the x-coordinate, which is 0 at that position.

Would you like more details or have any questions?

Here are some related questions you might find interesting:
1. What is the sine of \( 90^\circ \)?
2. How do you calculate the cosine of other common angles, like \( 30^\circ \) or \( 60^\circ \)?
3. What are the trigonometric functions of angles in radians?
4. Can you explain the unit circle and its connection to trigonometry?
5. How does cosine change in different quadrants?

**Tip:** The cosine function is positive in the first and fourth quadrants of the unit circle and negative in the second and third.

Explore the value of cos 90 degrees (cos 90° = 0) explained with clarity. This problem relates to trigonometry and the unit circle, illustrating how the cosine function behaves at specific angles. Suitable for students in Grades 9-12.

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