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| 1. |
Prove that }∑_{k=0}^nC_k\operatorname{sin}Kx\cdot\operatorname{cos}(n-K)x=2^{n-1}\operatorname{sin}nx |
| Answer» Prove that }∑_{k=0}^nC_k\operatorname{sin}Kx\cdot\operatorname{cos}(n-K)x=2^{n-1}\operatorname{sin}nx | |