√3(sin^2 105° - cos^2 105°)

Question

√3(sin^2 105° - cos^2 105°)

Answer 1

√3(sin²105°-cos²105°)=-√3(cos²105°-sin²105°)=-√3cos210°=
=-√3cos(π+30°)=-√3(-cos30°)=√3cos30°=√3·√3/2=3/2=1,5