Go on: wolframalpha dot com
When page be open in rectangle type:
and click option =
After few seconds when you see result click option:
let y = x +1 + 1/(x+2)
= x + 1 + (x+2)^-1
dy/dx= 1 - (x+2)^-2
= 1 - 1/(x+2)^2
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