let us use the standard library instead of an own pow function
let us use the standard library instead of an own pow function

Change-Id: Ib1c28fbb5d34409a42b7ea594cde9c1c1cdccdd8

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core