Example 19-5. Use the method of separation of symbols to prove the following identities : n +1 n + 1 (4) Uo + Uz + .. + U, = ( "i') Uo+("¿') auo +( "3 ') srUo + - +( ::) a-u, %3D + on (b) Uz x + Uz x² + Uz x³ + . - +aU, + ap4?U, +.. U1+ %3D (1 – x)' (1– x)3

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