8.30.7 Math Builtins
The following built-in functions may be used to generate a floating-point value. All return a floating-point value except $cvi, $int, and $sgn, which return an integer value.
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$acos(expr) - Returns the floating point arccosine of expr.
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$asin(expr) - Returns the floating point arcsine of expr.
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$atan(expr) - Returns the floating point arctangent of expr.
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$atan2(expr1,expr2) - Returns the floating point arctangent of expr1 / expr2.
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$ceil(expr) - Returns the smallest integer not less than expr as floating point.
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$cosh(expr) - Returns the floating point hyperbolic cosine of expr.
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$cos(expr) - Returns the floating point cosine of expr.
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$cvf(expr) - Returns the integer value expr converted to floating-point.
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$cvi(expr) - Returns the floating point value expr converted to integer.
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$exp(expr) - Returns the floating point value e ^ expr.
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$fabs(expr) - Returns the floating point absolute value of expr.
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$floor(expr) - Returns the largest integer that is not greater than expr as floating point.
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$fmod(expr1,expr2) - Returns the floating point remainder of expr1 / expr2.
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$int(expr) - Returns 1 if expr evaluates to an integer, zero otherwise.
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$ldexp(expr1,expr2) - Returns the floating point value expr1 * 2 ^ expr2.
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$log10(expr) - Returns the base 10 logarithm of expr.
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$log(expr) - Returns the natural logarithm of expr.
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$max(expr1,expr2) - Returns the floating point maximum of expr1 and expr2.
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$min(expr1,expr2) - Returns the floating point minimum of expr1 and expr2.
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$pow(expr1,expr2) - Returns the floating point value expr1 ^ expr2.
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$round(expr) - Returns the nearest integer to expr as a floating point number.
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$sgn(expr) - Returns -1, 0, or 1 based on the sign of expr.
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$sin(expr) - Returns the floating point sine of expr.
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$sinh(expr) - Returns the floating point hyperbolic sine of expr.
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$sqrt(expr) - Returns the floating point square root of expr.
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$tan(expr) - Returns the floating point tangent of expr.
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$tanh(expr) - Returns the floating point hyperbolic tangent of expr.
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$trunc(expr) - Returns the integer value of expr truncated towards zero as floating point.