cos d, если Sin d = 1.73/3

Sin d = 1.73/3
Соs=2.36/5

sin d = 1,73/3 = √3/3; cos d = (+/-) √(1 - sin²d) = (+/-) √(1 - (√3/3)²) = (+/-) √(1 - 3/9) = (+/-) √(1 - 1/3) = (+/-) √(2/3)