Hello.

Question:

Show that y=2sqrt(1-x^2) and y=sqrt(1-x^2) intersect at (1,0)and (-1,0). Find the volume of the solid when the enclosed region is rotated.

A) about the y-axis.

I already calculated the x-axis and I got it right.

My attempt:

I don't know how to use the program and insert the cool f's and stuff.

so I will skip that bit

pi(-(2)^3/12 +2) - pi(-(1)/5) + 1)

pi(-(4/3) - pi(4/5)

My answer is way wrong please help me.

Thanks