What's the value of cos?

As we enter the fourth quadrant, from 270° to 360° or equivalently 0° (due to the circular nature), the cosine function returns to positive values. Here, cos(x) once again ranges from 0, but not including 0, to 1. This positive range signifies the cosine's ascent as it completes its cycle and returns to the positive x-axis.

Understanding the behavior of cosine functions within different quadrants of the unit circle is crucial in trigonometry. Each quadrant displays distinct ranges of cosine values.

In the first quadrant, spanning from 0° to 90°, the cosine function yields positive values. Specifically, the cos(x) value ranges from 0, but not including 0, to 1. This reflects the decreasing nature of cosine as the angle increases within this quadrant.

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