I m confused
volume= (pie.r^3)/6
dv/dr????
Why dont we use product rule here???????????????
You could if you want but since the volume is just a constant times , and we know how to differentiate that directly (the power rule) we don't need to.
That is after your first week of calculus you should know:
Using the product rule for this we need to know that , then it goes:
RonL