Cos(n/2-t)ctg(-t)/sin(n/2+t)

Question

Cos(n/2-t)ctg(-t)/sin(n/2+t)

Answer 1

1-sin(n/2-t)ctg(-t)/sin(n/2+t)=1-sin(n/2-t)ctg(-t)/-sin(n/2-t)=1-1ctg(-t)=tg(-t)