Respuesta :
The fact that cos(x)=sin(90°−x) can help us here.
The equation can be rewritten as:
sin(x° − 20°) = sin(90° - 42°) = sin(48°)
so x-20 = 48 => x=68°
The equation can be rewritten as:
sin(x° − 20°) = sin(90° - 42°) = sin(48°)
so x-20 = 48 => x=68°