Вычислите 6√7sin(arccos(√2/3))

Question

Вычислите 6√7sin(arccos(√2/3))

Answer 1

Sin(arccosx)=√(1-x²)
6√7sin(arccos(√2/3))=6√7*√(1-2/9)=6√7*√7/3=2*7=14

Comments

(2/3)^2 cлучаем не 4/9?