a.) At what points does the graph cross the x-axisthe graph crosses the x-axis when y= 0, so would it be when x= -2pi, -pi, pi, 2pi, 3pi, 4 pi... etc. (the problem doesn't give me a range..)

b.) What is the relation between f(x) and tan(x) at points x≠ 0 at which f(x) = 0?i don't know what to do for this part.. i graphed it on my calculator but it just looks weird. lol..

c.) What is the behavior of f as |x| -->infinity

i'm not sure how i should answer this... the graph oscillates from (0, infinity)?

It'd be great if you can leave a comment to help me