That little apostrophe next to the y in the second picture indicates that he took the derivative of the equation in the top picture. It’s calculus. The shortcut that you learn is to take the exponent of the variable, decrease it by one (in this case, from 4 to 3) then move the number (in this case, 4) to the front.
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So she blocks him because he didn’t realize pi was a constant, not a variable, while trying to impress her with calculus