Catalan Number Proof

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We know for Catalan Numbers,there are: $$C_n = \frac{1}{n+1}\binom{2n}{n}$$and $$C_0 = 1,\qquad C_{n+1}=\sum_{i=0}^{n} C_i\, C_{n-i}\,.$$But how can I plug the upper one into the lower one and check if it really works or not through algebraic manipulation?