설정 z = e ^ (x - 2y), x = sint, y = t ^ 3, dz / dt

설정 z = e ^ (x - 2y), x = sint, y = t ^ 3, dz / dt

dz / dt = (dx / dt - 2dy / dt) * e ^ (x - 2y) = (cost - 60t ^ 2) * e ^ (x - 2y)