find volume of the solid obtained by rotating the region bounded by the curves y=0, y=sinx, 0<=x<=pi about line y=-2.

I got as far as the diagram and the starting off equation.

If I could get some help that would be great. Thanks

lim  (x+2cos/4x+sinx)
 x-∞

Hello,
Not to be a bother, but I have question about problem solving:

A baseball diamond is a square with side 90ft. A batter hits the ball and runs toward first base with a speed of 24ft/s.
a) At what rate is his distance from second base decreasing when he is halfway to first base?
b) At what rate is his distance from third base increasing at the same moment?

This question is worded strangely so thats what I'm having trouble approaching it, but it has to do with related rates.

Thanks in advance

y= fourth root (x+1/x-1), solve using logarithmic differentiation.
y= (x+1/x-1)(I think that would be the other way to write this problem).

Thanks