cos(a+b)+cos(a-b)/sin(a+b)+sin(a-b)化简_数学解答

cos(a+b)+cos(a-b)/sin(a+b)+sin(a-b)化简

人气：472 ℃　时间：2020-02-06 08:49:47

解答

=(cosacosb-sinasinb+cosacosb+sinasinb)/(sinacosb+cosasinb+sinacosb-cosasinb)
=2cosacosb/2sinacosb
=cota