Describe the broader historical situation in Africa at the time that Jean barbot wrote his book

See diagram.we use washers to get the area and we will be integrating with respect to xouter radius is the  distance between y = e^x and y = -1    inner radius of washer is the distance between y = 1 and y = -1    the area of one cross-section of a washer is    solid lies between x = 0 and x = 2. the volume is    if you need this expanded, then    the question doesn't say to evaluate, so we're done.   

It took me a while to figure out this complex expression but i believe the answer you’re looking for is

but i am not sure because i am not at that level of math yet.