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var pi = Math.PI,
    halfPi = pi / 2;

export function sinIn(t) {
  return (+t === 1) ? 1 : 1 - Math.cos(t * halfPi);
}

export function sinOut(t) {
  return Math.sin(t * halfPi);
}

export function sinInOut(t) {
  return (1 - Math.cos(pi * t)) / 2;
}