how to rotate a filled area of integral in 2D graph
Suppose the area is defined as
How to rotate it around a fixed point, e.g., (pi/4,1/2) at an arbitrary angle (slider between 0 and 360 degrees)?
I found it is impossible to use
immediately.When I try to create a locus with a curve and two segments, so that I can rotate the parametric equations of the boundaries:
but I cannot obtain the right filling effects desired. The shading is closely tied to the curve on its both sides.
And if there is any maloperation further, all objects that were created will disappear and cannot be undone.(The last one seems to be a bug in 5.0.379 but fixed in 5.0.380 )