-sinx=cos((3π/2-x)从-sinx推导
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/27 20:03:55
![-sinx=cos((3π/2-x)从-sinx推导](/uploads/image/z/7020388-28-8.jpg?t=-sinx%3Dcos%28%283%CF%80%2F2-x%29%E4%BB%8E-sinx%E6%8E%A8%E5%AF%BC)
x)-̫M/0>ߠo[dwXYߊ$cSGS_`gC y=p&U~O7P9T lPk}1Y`&T4<;{l
p{@pK&* B6ԷRFt>ŦV Ya
-sinx=cos((3π/2-x)从-sinx推导
-sinx=cos((3π/2-x)
从-sinx推导
-sinx=cos((3π/2-x)从-sinx推导
cos(3π/2-x)=cos(3π/2)cosx+sin(3π/2)sinx=-sinx
则:
-sinx=cos(3π/2-x)
-sinx = cos(π/2)cosx-sin(π/2)sinx
= cos(π/2+x)
= cos[2π-(3π/2-x)]
= cos(3π/2-x)