Ответ: (√3 ) /2 .
Пошаговое объяснение: cos57,5° cos27,5° + sin57,5° sin27,5° =
= cos (57,5° - 27,5° ) = cos 30° = (√3 ) /2 .
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Ответ: (√3 ) /2 .
Пошаговое объяснение: cos57,5° cos27,5° + sin57,5° sin27,5° =
= cos (57,5° - 27,5° ) = cos 30° = (√3 ) /2 .