Respuesta :
[tex](csc(x)-1)(csc(x)+1)=csc^2(x)-1=cot^2(x)[/tex]
We know that [tex]csc^2(x)-1=cot^2(x)[/tex] because of the Pythagorean trig identity [tex]1+cot^2(x)=csc^2(x)[/tex].
We know that [tex]csc^2(x)-1=cot^2(x)[/tex] because of the Pythagorean trig identity [tex]1+cot^2(x)=csc^2(x)[/tex].