Top network posts

• 61 Why does $\tan^{-1}(1)+\tan^{-1}(2)+\tan^{-1}(3)=\pi$?
• 61 Strategies to denest nested radicals $\sqrt{a+b\sqrt{c}}$
• 26 Find all $n>1$ such that $\dfrac{2^n+1}{n^2}$ is an integer.
• 26 Seems that I just proved $2=4$.
• 23 Show that $\sqrt[3]{2+\frac {10} 9\sqrt 3}+\sqrt[3]{2-\frac {10} 9\sqrt 3}=2$
• 19 Show that $d/dx (a^x) = a^x\ln a$.
• 19 When will $AB=BA$?
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