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Zxðz/ðx − zyðz/ðy = y²−x² |
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I can't understand i am sorry I don't KNOWI can't understand i am sorry I don't knowI can't understand i am sorry I don't KNOW
I can't understand i am sorry I don't know I can't understand i am sorry I don't knowI can't understand i am sorry I don't knowI can't understand i am sorry I don't know
I can't understand i am sorry I don't know I can't understand i am sorry I don't knowI can't understand i am sorry I don't knowI can't understand i am sorry I don't know
I can't understand i am sorry I don't knowI can't understand i am sorry I don't knowI can't understand i am sorry I don't know
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