Some cmath function prototypes

• double sqrt(double x) - square root
• double pow(double x, double y) - x raised to the power y
• double ceil(double x) - smallest integer not less than x
• double floor(double x) - largest integer not greater than x
• double fabs(double x) - absolute value of a floating point
• double fmod(double x, double y) - floating point remainder of x/y
• double exp(double x) - exponential
• double log(double x) - natural logarithm
• double log10(double x) - base 10 logarithm
• double cos(double x) - cosine
• double sin(double x) - sine
• double tan(double x) - tangent
• double acos(double x) - arc cosine
• double asin(double x) - arc sine
• double atan(double x) - arc tangent
• double atan2(double y, double x) - arc tangent of y/x
• double cosh(double x) - hyperbolic cosine
• double sinh(double x) - hyperbolic sine
• double tanh(double x) - hyperbolic tangent