- #1

Reflected

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firstcylinder =

ParametricPlot3D[{Cos[t], u, Sin[t]}, {t, 0, 2 Pi}, {u, -2, 2} ,

PlotStyle -> {Red, Opacity -> .3}, Mesh -> None];

Show[firstcylinder]

Draw a second cylinder that is perpendicular to the given cylinder.

Draw a three-dimensional curve that shows that complete intersection of the two cylinders.

Need help!