if
![2 {}^{x} - 2 {}^{y } = 2 {}^{x - y} 2 {}^{x} - 2 {}^{y } = 2 {}^{x - y}](https://tex.z-dn.net/?f=2+%7B%7D%5E%7Bx%7D++-+2+%7B%7D%5E%7By+%7D++%3D+2+%7B%7D%5E%7Bx+-+y%7D+)
then dy/dx at x =y=2
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don't know bro sorry for the attitude
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