Упростить выражение:
1. cos165° + sin75°;
2. cos97° + cos83°;
3. cos165° – cos105°;
4. sin(π/3 + α) – sin(π/3 - α).
1. cos165° + sin75°;
2. cos97° + cos83°;
3. cos165° – cos105°;
4. sin(π/3 + α) – sin(π/3 - α).
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Answers & Comments
2. и 3. на фото
4. не знаю, сори