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Test the Math:
\cos (2\theta) = \cos^2 \theta - \sin^2 \theta
\lim_{x \to \infty} \exp(-x) = 0
f(n) = n^5 + 4n^2 + 2 |_{n=17}
\frac{\frac{1}{x}+\frac{1}{y}}{y-z}

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