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• 28 Find the value of $\space\large i^{i^i}$?
• 12 How to prove that $\lim\limits_{x\to0}\frac{\tan x}x=1$?
• 12 Does $z^i=i^z$ have any solutions, beside $z=i$?
• 11 The value of $\sqrt{1-\sqrt{1+\sqrt{1-\sqrt{1+\cdots\sqrt{1-\sqrt{1+1}}}}}}$?
• 11 integer solutions of $a^3 + b^2 = 100000$
• 10 The indefinite integral $\int{\frac{\mathrm dx}{\sqrt{1+x^2}}}$
• 9 How to justify the solution of this problem?
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