/**
 * Complementary error function.
 *
 * Calculates the complementary error function, which is widely used in probability, statistics, and partial differential equations.
 *
 * The complementary error function is defined as:
 *
 * ```
 *            2     ∞
 * erfc(x) = ───  ∫  e^(-t²) dt  =  1 - erf(x)
 *           √π    x
 * ```
 *
 * This implementation provides an approximation with a high degree of accuracy.
 *
 * @param x A real value
 * @returns The value of the complementary error function for the input x
 * @throws If no arguments are provided
 *
 * @example Compute the complementary error function for a single value
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(erfc(0.5), 0.47950009227675744);
 *
 * ```
 *
 * @example Compute the complementary error function for a negative value
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(erfc(-1), 1.8427007877600068);
 *
 * ```
 *
 * @example Compute the complementary error function for zero
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(erfc(0), 1);
 *
 * ```
 *
 * @example Compute the complementary error function for a large positive value
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(erfc(2), 0.004677734989334044);
 *
 * ```
 *
 * @example Compute the complementary error function for a large negative value
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(erfc(-2), 1.995322265010666);
 *
 * ```
 */
export default function erfc(x: number): number;
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