A cubic animation curve that starts slowly and ends quickly. Based on a
quadratic equation where
f(t) = t², this is effectively the inverse of
Compared to Curves.easeInSine, this curve is slightly steeper.
Derived from Robert Penner’s easing functions.
static const Cubic easeInQuad = Cubic(0.55, 0.085, 0.68, 0.53);