Hello !

Your problems are really challenging

I don't know if I'm going to do it correctly...but well, what happens if one doesn't try anything ?

I'll study first

(I know we can do it in a more direct way, but it doesn't matter)

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Now, remember that :

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Similarly, we get :

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Multiply by :

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Yay !

Edit : and this was done assuming that x had values that didn't impeach anything in it...

Re-edit : new release, mistakes corrected