trestres on 23 June 2008
Then if x isn't a variable you can't do dy/dx as it's not a function since there's no "y".
If x=1, means that y=1 at that point.
But you can't replace the function for its value at that point before derivating.
You must derivate before replacing a value. That's the initial mistake.
Because if not you will be derivating f(x)=1 instead of f(x)=x, which are two different functions with 2 different derivates.
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