me assume that stuf shood be
kosine(30)*sine(-50) / tan(70)...all in degrees
sine(50)=0.766044443118978, so sine(-50)=-0.766044443118978
tan(70)=2.7474774194546216
then du 1/x tu get divide bi tan...0.36397023426620534
kosine(30)=0.8660254037844386467637231707...also kalled sqrt(3)/2
kosine*sine(-50)=0.8660254*(-766044443...)=-0.6634139452698902
me leev it tu yu tu divide bi tan(70)...value up abuv
multipli the sine & kosine...