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“To find the derivative of something like x^3, take the exponent, put it at the front, and subtract one from that exponent. That’d be 3x^2,” a voice said in the back of Elen’s mind. 18-year-old Elen Cavendish sat in Intro to Calculus, half-listening to the teacher. Finding herself utterly unable to concentrate on the teacher, she turned her attention to more interesting things; like drawing people, flowers, and whatever else …
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