The Math Object
puts(Math::PI) puts(Math::E) puts(Math.cos(Math::PI/3)) puts(Math.tan(Math::PI/4)) puts(Math.log(Math::E**2)) puts((1 + Math.sqrt(5))/2) # 3.14159265358979 # 2.71828182845905 # 0.5 # 1.0 # 2.0 # 1.61803398874989