## Answer :

cos(α)=0.75

arccos(0.75)=α

sin((arccos(0.75))/2)*sin(5((arccos(0.75))/2)

≈36.601

arccos(0.75)=α

sin((arccos(0.75))/2)*sin(5((arccos(0.75))/2)

≈36.601

**Ans:**≈36.601