Question

Cos(pi/2+t)ctg(-t)/sin(pi/2-t)упростите выражение

Answer 1

$frac{cos(frac{pi}{2}+t)ctg(-t)}{sin(frac{pi}{2}-t)}= frac{-sin(t)(-ctg(t))}{cos(t)}= frac{sin(t)}{cos(t)} *ctg(t)=tg(t)*ctg(t)=1$