Horstmann Chapter 3

Mathematical Functions

`Math.sqrt(x)`	square root
`Math.pow(x, y)`	power x^y
`Math.exp(x)`	e^x
`Math.log(x)`	natural log
`Math.sin(x), Math.cos(x), Math.tan(x)`	sine, cosine, tangent (x in radian)
`Math.round(x)`	closest integer to x