On an inclined plane, "\SigmaFy = N - mg cos ø = ma = 0".
And "\SigmaFx = mg sin ø = ma" (frictionless).
So, in the y direction, "N = mg cos ø".
But on a banked curve, "\SigmaFy = N cos ø - mg = ma= 0".
And "\SigmaFx = N sin ø = ma = mv²/r" (frictionless).
So, in the y direction, "N cos...