Finding th value of x and radian when volume is maximum

[gohanhope]

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

 

[gohanhope]

http://kinimage.naver.net/storage/upload/2006/08/15/xorien_1156812293.jpg

 

[data1217]

You can derivate the given function of volume with respecting to x
dV/dx = 0, solve the equation. Then the result follow.

 

[gohanhope]

thank you. i wasn't sure.