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6 = 22 + 12√2 cos Ф
12√2 cos Ф = -16
Ф = 160,5'
= 6 / 3√2 (2)
= 6 / 6√2
= 6 / 6√2 x √2 / √2
= 6√2 / 12
= 1√2 /2
cos α = 1√2 /2
α = 45 derajat