sin(x-45°)=?,cos(x-45°)=?,tan(x-45°)=?_数学解答

sin(x-45°)=?,cos(x-45°)=?,tan(x-45°)=?

人气：455 ℃　时间：2020-10-01 12:27:05

解答

sin(x-45°)=根号2/2(sinx-cosx)
cos(x-45°)=根号2/2(sinx+cosx)
tan(x-45°)=(sinx-cosx)/(sinx+cosx)=-cos2x/(1+sin2x)