Question

cos 65° cos 18° +sin 63° sin 18°​

Answer 1

Ответ:

Альтернативная форма : ≈0,67727

Объяснение:

cos65° cos18° + 1/2 cos45° - cos81° = cos65° cos18° + 1/2 * √2/2 * cos81° = cos65° cos18° + √2/4 - cos81°/2