If you sketch a unit circle with angle θ in standard position: For what values of θ is the sine increasing? Decreasing?

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For what values of θ is the cosine increasing? Decreasing?
For which angle between 0° and 360° is sine equal to 0? Where is cosine equal to 0?

Guest May 3, 2017

CPhill · Answer 1 · 2017-05-03T03:11:08

The sine increases from 0 to 90 degrees and from 270 to 360 degrees

The sine decreases from 90 to 270 degrees

The cosine increases from 180 to 360 degrees

The cosine decreases from 0 to 180 degrees

Sine = 0 at 0 and 180 degrees

Cosine = 0 at 90 and 270 degrees