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15. Simplify:cot (b-c)cot (c-a)+cot (c-a)cot (a-b)+cot (a-b)cot (b-c) |
| Answer» 15. Simplify:cot (b-c)cot (c-a)+cot (c-a)cot (a-b)+cot (a-b)cot (b-c) | |