Ответ:
-√3/2
Пошаговое объяснение:
cos²(7π/12) - sin²(7π/12) = cos(2 * 7π/12) = cos(7π/6) = -√3/2
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Verified answer
Ответ:
-√3/2
Пошаговое объяснение:
cos²(7π/12) - sin²(7π/12) = cos(2 * 7π/12) = cos(7π/6) = -√3/2