Ответ:
16/65
Пошаговое объяснение:
cosx = -√(1 - 9/25) = -4/5
siny = -√(1 - 25/169) = -12/13
cos(x+y) = cosxcosy - sinxsiny = -20/65 + 36/65 = 16/65
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Verified answer
Ответ:
16/65
Пошаговое объяснение:
cosx = -√(1 - 9/25) = -4/5
siny = -√(1 - 25/169) = -12/13
cos(x+y) = cosxcosy - sinxsiny = -20/65 + 36/65 = 16/65