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I'm unsure when to apply the appropriate methods and how to make the correct partitions.

Please tell me if my reasoning is correct:

The disk/washer method is applied when your partitions are

*perpendicular*to the axis of rotation and you use perpendicular partitions when your function is given by [tex]y = f(x)[/tex].

The shell method is used when the partitions are

*parallel*to the axis of rotations and you use horizontal partitions when the functions is given by [tex]x = f(y)[/tex].

Is this correct?

Thanks!

Steven