36 = 36 + 36 - 2*6*6*cos a
36 = 36 + 36 - 72cos a
36 = 72cos a
1/2 = cos a
Ответ: cos a = 1/2
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36 = 36 + 36 - 2*6*6*cos a
36 = 36 + 36 - 72cos a
36 = 72cos a
1/2 = cos a
Ответ: cos a = 1/2