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Math functions from the Math module

Ruby methods ending in ! mean that the method makes in-place, or destructive, changes to an object, not to a copy of it. Method(s)                                             Description Math.acos, Math.acos!                                 Arc cosine Math.acosh, Math.acosh!                               Hyperbolic arc cosine Math.asin, Math.asin!                                 Arc sine Math.asinh, Math.asinh                                Hyperbolic arc sine Math.atan, Math.atan!, Math.atan2, Math.atan2!        Arc tangent; atan takes an x argument; atan2 takes an x and a y argument Math.atanh, Math.atanh!                               Hyperbolic arc tangent Math.cos, Math.cos!                                   Cosine Math.cosh, Math.cosh                                  Hyperbolic cosine Math.sin, Math.sin!                                   Sine Math.erf                                              Error function Match.erfc                                            Complementary error function Math.exp, Math.exp!                                   Base x of Euler Math.frexp                                            Normalized fraction and exponent Math.hypot                                            Hypotenuse Math.ldexp                                            Floating-point value corresponding to a given mantissa and exponent Math.sinh, Math.sinh!                                 Hyperbolic sine Math.sqrt, Math.sqrt!                                 Square root Math.tan, Math.tan!                                   Tangent Math.tanh, Math.tanh!                                 Hyperbolic tangent