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• 13 $x^n+nx-1$ has a unique solution
• 11 Show that $\int_0^\infty\frac{\arctan(\mathrm{πx})-\arctan(\mathrm x)}xdx=\;\frac{\mathrm\pi}2\ln(\pi)$ using 12th grade calculus.
• 11 Absolute convergence of $\sum_{n=0}^{\infty}a_n\implies\sum_{n=0}^{\infty}a_n^2$ is absolute convergent too
• 11 Generalizing a Trig Identity
• 8 Union of Balls around Rationals
• 8 Density of multiplication table
• 8 Equivalence between two definitions of Hausdorff metric.
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