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Algebra



Squaring numbers in your head52 squared = a^2 + 2ab + b^2 = 50*50 + 2(50 x 2) + 2*2 = 2500 + 200 + 4 = 2704
for numbers around 50
take 2500 add/sub 100 x last digit and add last digit squared
55 = 2500 + 500 + 25 = 3525




Fractals

The Mandelbrot Set

Matrices

Prime Numbers


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