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

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
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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

 

 

cool cool cool

CPhill  May 3, 2017

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