Fibonacci Numbers and the Golden Ratio
Why does the equation 1 = 1/a − a produce 0.618, and what does self-similarity really mean?
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Divide, Multiply, Subtract, Bring Down
Divide polynomials in x while treating y as a coefficient, and check the remainder quickly.
Sliding Lines
Translate points and lines, derive g(x) = f(x − h) + k, and see why slope stays unchanged.