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hm. have you learned derivatives yet?

not yet(

That's the graph
http://www.wolframalpha.com/input/?i=y%3D-5cos%28x%29

ok, so all you have to do is draw out the function and I guess just look at it.

yeah, good.

yes, but can you plz exactly say where it is increasing?

once it hits pi, it starts to move down instead.

therefore your answer is [0, pi]. hopefully that helped.

oh, thanks so much)