# How to repeat a plot with different options

I'd like to have first a function plot and then the same plot repeated inside a Manipulate, with additional things (like tangent planes etc.). I can do

plot=Plot3D[<whatever>]


and then

Manipulate[Show[plot,<whatever>],...]


but there is one problem. I'd like to have the second plot semi-opaque, so that things are more visible.

My question is either (1) how to achieve this using my approach with plot=Plot3D[...], or (2) is there any better approach?

I've seen this question, but the first answer seemed too complicated (am I wrong?) and the second one didn't work for me...

-

plot[opt : OptionsPattern[Plot]] := Plot[Sin@x, {x, 0, 2 Pi}, Filling -> Bottom, opt];

Manipulate[