PLEASE HELP ME!!!!!!! REALLY IMPORTANT!!!!!!!!!
y = −5 cos x
On what intervals within [0, T) is f increasing? (T is the period of the function. Enter your answer using interval notation. If an answer does not exist, enter DNE.)

Question

PLEASE HELP ME!!!!!!! REALLY IMPORTANT!!!!!!!!!
y = −5 cos x
On what intervals within [0, T) is f increasing? (T is the period of the function. Enter your answer using interval notation. If an answer does not exist, enter DNE.)

ggrree · Answer

hm. have you learned derivatives yet?

anonymous · Answer

not yet(

anonymous · Answer

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

ggrree · Answer

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

ggrree · Answer

yeah, good.

anonymous · Answer

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

ggrree · Answer

notice that it starts at -5, right? it keeps going up from there. it's still moving up once it crosses the x axis.

ggrree · Answer

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

ggrree · Answer

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

anonymous · Answer

oh, thanks so much)