Question

 1)42sin413/sin53
 2)30 корень 6 cos (-pi/4) sin (-pi/3)
 3)-4cos26/cos154

Answer 1

1)42sin413/sin53=42sin(360+53)/sin53=42sin53/sin53=42
 2)30  √6 cos (-pi/4) sin (-pi/3)=30√6*√2/2*(-√3/2)=-45
 3)-4cos26/cos154=-4cos26/cos(180-26)=-4cos26/(-cos26)=4