export declare function cubicAt(p0: number, p1: number, p2: number, p3: number, t: number): number;
export declare function cubicDerivativeAt(p0: number, p1: number, p2: number, p3: number, t: number): number;
export declare function cubicRootAt(p0: number, p1: number, p2: number, p3: number, val: number, roots: number[]): number;