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| Question | Answer |
| Sin(п+a)= | -Sin(a) |
| Sin(п-a)= | Sin(a) |
| Sin(п/2+a)= | Cos(a) |
| Sin(п/2-a)= | Cos(a) |
| Sin(3п/2+a)= | -Cos(a) |
| Sin(3п/2-a)= | -Cos(a) |
| Sin(2п+a)= | Sin(a) |
| Sin(2п-a)= | -Sin(a) |
| Cos(п+a)= | -Cos(a) |
| Cos(п-a)= | -Cos(a) |
| Cos(п/2+a)= | -Sin(a) |
| Cos(п/2-a)= | Sin(a) |
| Cos(3п/2+a)= | Sin(a) |
| Cos(3п/2-a)= | -Sin(a) |
| Cos(2п+a)= | Cos(a) |
| Cos(2п-a)= | Cos(a) |
| Tg(п+a)= | Tg(a) |
| Tg(п-a)= | -Tg(a) |
| Tg(п/2+a)= | -Ctg(a) |
| Tg(п/2-a)= | Ctg(a) |
| Tg(3п/2+a)= | -Ctg(a) |
| Tg(3п/2-a)= | Ctg(a) |
| Tg(2п+a)= | Tg(a) |
| Tg(2п-a)= | -Tg(a) |
| Ctg(п+a)= | Ctg(a) |
| Ctg(п-a)= | -Ctg(a) |
| Ctg(п/2+a)= | -Tg(a) |
| Ctg(п/2-a)= | Tg(a) |
| Ctg(3п/2+a)= | -Tg(a) |
| Ctg(3п/2-a)= | Tg(a) |
| Ctg(2п+a)= | Ctg(a) |
| Ctg(2п-a)= | -Ctg(a) |