To find the value of $\cos(270^\circ)$:

1. The cosine function gives the x-coordinate of a point on the unit circle corresponding to the given angle.
2. $270^\circ$ is an angle located on the negative y-axis.
3. On the unit circle, at $270^\circ$, the point is $(0, -1)$.

Thus, the cosine of $270^\circ$ is:

$\cos(270^\circ) = 0$

Would you like more details or have any other questions? Here are five related questions to expand your understanding:

1. What is the sine of $270^\circ$?
2. How can we compute cosine values for angles not on the axes?
3. What is the value of $\cos(90^\circ)$?
4. Can you explain the difference between sine and cosine in terms of the unit circle?
5. How do cosine values change across the four quadrants?

Tip: Remember, the cosine function represents the x-coordinate on the unit circle for any angle, while sine represents the y-coordinate.