Advanced coordinate rotation: possible typo?

[edwardball]

Hi Billy, great book.

On page 228, there's a couple of equations

x1 = (x-centerX) * cos(rotation) - (y-centerY) * sin(rotation)
y1 = (y-centerY) * cos(rotation) + (x-centerX) * sin(rotation)

I tried coding these up and it certainly rotates the point, but it is offset by (-centerX, -centerY)

Should the equations be these?

x1 = centerX + [(x-centerX) * cos(rotation) - (y-centerY) * sin(rotation)]
y1 = centerY + [(y-centerY) * cos(rotation) + (x-centerX) * sin(rotation)]

Cheers,

Ed