I feel bad asking this as I'm pretty sure it is simple, but I just can't seem to get it.

I have 2 images, with the red dot in the same x/y coordinate, except 1 is rotated. I add the red dot before I rotate the image, so that was easy enough.

However, what I want to do is add the dot after the image is rotated with the same X/Y coordinate.

Here is the image, not rotated.



Here is the image rotated at 35 degrees




What formula would I use to get the correct pixel locationon the rotated image, to match the non-rotated image?

Thanks,

Smitty