奇函數(shù)乘以奇函數(shù)是偶函數(shù),奇函數(shù)加上或減去偶函數(shù)是非奇非偶函數(shù),奇偶函數(shù)加減乘除后的奇偶性,偶函數(shù)乘偶函數(shù)是偶函數(shù),奇偶函數(shù)加減乘除后的奇偶性:奇函數(shù)乘以偶函數(shù)是奇函數(shù)。