The cosine is the horizontal component of the angle. The sine is the vertical component. At the left and right extremes of the circle, the cosine is widest, while at the top and bottom extremes of the circle, the sine is at its greatest value. Since the circle is symmetrical, it follows that values will be periodic.
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Answer:
The cosine is the horizontal component of the angle. The sine is the vertical component. At the left and right extremes of the circle, the cosine is widest, while at the top and bottom extremes of the circle, the sine is at its greatest value. Since the circle is symmetrical, it follows that values will be periodic.
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