If the equation you are being asked to find the derivative of has variables all mixed together, and no matter what you try, you cannot get the equation to a format of the *y-piece* (dependent variable) on one side of the equals and all the *x’s* (independent variables) are on the other side of the equals.

Or if you are being asked to take the derivative “with respect to” a variable that does not match with the variables in your equation. You have an equation with *x’s* and *y*’s and you are being asked to take a derivative “with respect to” ** t**.

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