Top Network Posts

• 17 Sum of series $\sum \limits_{k=1}^{\infty}\frac{\sin^3 3^k}{3^k}$
• 15 $A+B+C+7$ is perfect square where $A,B,C$ numbers with repeating digits.
• 12 Solve an equation of 4th degree
• 11 Infinite group has infinitely many subgroups, namely cyclic subgroups.
• 10 If $\lim_{x \to \infty} (f(x)-g(x)) = 0$ then $\lim_{x \to \infty} (f^2(x)-g^2(x)) = 0\ $: False?
• 10 Looking for a non-combinatorial proof that $a! \cdot b! \mid (a+b)!$
• 8 Problem 30 from Shakarchi Stein's book
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