Question

30 cos(0.5arccos0.62)

Answer 1

30 cos(0.5arccos0.62)=27
30*√1+cos(arccos(0.62)/2=30*√1.62/2=30*0.9

Answer 2

а решение можно?

Answer 3

да надо разложить cos по формуле cos(x/2)

Answer 4

cos(x/2)=sqrt((1+cos2x)/2)

Answer 5

cos(arccosx)=x