I have a friend who used to teach math (calculus and precalc) in college,
and amazingly some people in his class still managed to do that kind of mathematic, I'm refering to the last 2 images. One guy managed to cancel the d in the derivative notation (dx/dy => x/y) hehe, and another guy pretty much flunked his test by answering most of the problem with "The answer is obvious!"


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