sin(5x)-cos(5x)=cos(5x)-sin(5x)
tan(5x) =1
5x =π/4 or 5π/4 or 9π/4 or 13π/4
x= π/20 or 5π/20 or 9π/20 or 13π/20
sin(5x)-cos(5x)=cos(5x)-sin(5x) 求x的值,用π表示 （0≤x≤π）
sin(5x)-cos(5x)=cos(5x)-sin(5x)
tan(5x) =1
5x =π/4 or 5π/4 or 9π/4 or 13π/4
x= π/20 or 5π/20 or 9π/20 or 13π/20