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kinda confused on the change of variable stuff (1 Viewer)

Run hard@thehsc

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Can someone explain to me how this change of variable works for the reflection property: how can we assume that when u = a - x, then x = u?
Thanks!!!
 

cossine

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Can someone explain to me how this change of variable works for the reflection property: how can we assume that when u = a - x, then x = u?
Thanks!!!
What theorem are you referring? Can you type it in Latex.
 

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