When is sin increasing and cos decreasing from -2π to 2π?

[404]

Over the interval (-2 pi, 2 pi), state where the following would be true:
a) sin theta is increasing
b) cos theta is decreasing

...Anyone know?

 

[Christina De Rose]

Draw a unit circle to help you.
Sin theta increases as the value of y increases. Cos theta increases as the value of x increases.

 

[recon]

Take a look at the figure here: http://www.blc.edu/fac/rbuelow/calc/imageIOH.JPG