Ответ:
sina^2 + cosa^2 = 1
cosa^2 = 1 - sina^2
cosa^2 = 1 - 20/25^2= 0.36
cosa = 0.6 или 3/5
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Ответ:
sina^2 + cosa^2 = 1
cosa^2 = 1 - sina^2
cosa^2 = 1 - 20/25^2= 0.36
cosa = 0.6 или 3/5