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Basic derivative rules: find the error


Emma tried to find the derivative of 1+6x using basic differentiation rules. Here is her work:
=ddx(1+6x)Step 1=ddx(1)+ddx(6x)Step 2=1+ddx(6x)Step 3=1+6ddx(x)Step 4=1+61Step 5=7
At which step did Emma make a mistake, if at all?
Choose 1 answer: