Computing the Volume of a solid of rotation using the Washer or Shell Method
can easily be performed using TiNSpire’s Calculus Made Easy app as follows.
After selecting the Washer Method about x-axis just enter the upper U and lower function L
(dont worry in case you swap them : the answer will be correct except it will have a minus sign with it. )
and the interval bounds a and b as shown in belows image:
You can see the general washer method formula and how it is applied to you specific problem.
Additionally, you will see the antiderivative (if it is exists), the exact and finally the correct decimal answer.
Finding the volume of solids of rotation and with known cross sections are just a few integral applications included in the Calculus Made Easy app of your TiNspire. Other included applications are surface area of solids, curve lengths, center of math, improper integrals, etc
Best of all Calculus Made Easy can be used for 3 courses of Calculus: Calculus I, II and III, the latter being a typical Multivariable Calculus course which involves partial derivatives and multiple integrals.