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math functions

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Mathematical functions are in the scala.math package, not in any class.

scala> import scala.math._
import scala.math._

scala> abs(-3)
res0: Int = 3

scala> Pi
res1: Double = 3.141592653589793

scala> max(9, 3)
res2: Int = 9

scala> random
res3: Double = 0.5491096848671302    // 0.0 <= (random double) < 1.0

scala> sqrt(2)
res4: Double = 1.4142135623730951

scala> pow(2, 3)    // python: 2**3
res1: Double = 8.0