(sin 67,5 cos 67,5)/(cos 30 градусов)

Question

(sin 67,5 cos 67,5)/(cos 30 градусов)

Answer 1

Sin(2*67,5)/2cos30=sin135/(2*√3/2)=sin(180-45)/√3=sin45/√3=√2/2√3=√6/6