Ответ:
- √2/2.
Объяснение:
cos (-135°) = cos135° = cos(180° - 45°) = - cos45° = -√2/2.
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Ответ:
- √2/2.
Объяснение:
cos (-135°) = cos135° = cos(180° - 45°) = - cos45° = -√2/2.