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**1. Homework Statement**

trying to prove left-hand side = right-hand side

this is where i'm stuck:

[tex]

1 - [1 / (x+1)!] + [(x+1) / (x+2)!] = 1 - [1 / (x+2)!]

[/tex]

**2. Homework Equations**

**3. The Attempt at a Solution**

i tried this but can't get anywhere

get a common demoninator:

1 - [(x+2)! + (x+1)*(x+1)! / (x+1)!*(x+2)!]

anyone seeing what i'm not seeing?