http://kor.i2p/books/The%20C%20Programming%20Language%20by%20K&R/appb.html
Angles for trigonometric functions are expressed in radians. sin(x) sine of x cos(x) cosine of x tan(x) tangent of x asin(x) sin -1 (x) in range [-pi/2,pi/2], x in [-1,1]. acos(x) cos -1 (x) in range [0,pi], x in [-1,1]. atan(x) tan -1 (x) in range [-pi/2,pi/2]. atan2(y,x) tan -1 (y/x) in range [-pi,pi]. sinh(x) hyperbolic sine of x cosh(x) hyperbolic cosine of x tanh(x) hyperbolic tangent of x exp(x) exponential function e x log(x) natural logarithm ln(x), x > 0. log10(x) base 10...