`<math.h>`

`abs`	Returns the absolute value of an integer.
`acos, acosl`	Calculates the arc cosine.
`asin, asinl`	Calculates the arc sine.
`atan, atanl`	Calculates the arc tangent.
`atan2, atan2l`	Calculates the arc tangent of ylx.
`atof, _atold`	Converts a string to a floating-point number.
`cabs, cabsl`	Calculates the absolute value of complex number.
`ceil, ceill`	Rounds up.
`cos, cosl`	Calculates the cosine of a value.
`cosh, coshl`	Calculates the hyperbolic cosine of a value.
`exp, expl`	Calculates the exponential e to the x.
`fabs, fabsl`	Returns the absolute value of a floating-point number.
`floor, floorl`	Rounds down.
`fmod, fmodl`	Calculates x modulo y, the remainder of x/y.
`frexp, frexpl`	Splits a number into mantissa and exponent.
`hypot, hypotl`	Calculates hypotenuse of a right triangle.
`labs`	Gives long absolute value.
`ldexp, ldexpl`	Calculates x x 2^^p.
`log, logl`	Calculates the natural logarithm of x.
`loglO, loglOl`	Calculates log io(^')-
`matherr, _matherrl`	User-modifiable math error handler.
`modf, modfl`	Splits a double or long double into integer and fractional parts.
`poly, polyl`	Generates a polynomial from arguments.
`pow, powl`	Calculates x to the power of y.
`pow10, pow10l`	Calculates 10 to the power of p.
`sin, sinl`	Calculates sine.
`sinh, sinhl`	Calculates hyperbolic sine.
`sqrt, sqrtl`	Calculates the positive square root.
`tan, tanl`	Calculates the tangent.
`tanh, tanhl`	Calculates the hyperbolic tangent. Real versions: Complex version: