14 Is the reasoning/algebra for my proof correct? (musical tuning theory proof) 11 Integrating $\sin(y^2)$ 11 Derivative of Integral with variable bounds 10 How do I get rid of the radical in the denominator of $\lim\limits_{x \to -9} \frac{x+9}{\sqrt{x+9}}$? 9 Use the triangle inequality to show that $|a|+|b| \leq |a+b|+|a-b|$

### Reputation (4,002)

 +10 Formula to find solution of a multi-angled trigonometry equation +10 Number theory problem book +10 Existence of roots of $A_1\sin(\omega_1t+\phi_1)+A_2\sin(\omega_2t+\phi_2)$ +10 Evaluate $\lim_{n \to \infty} \frac{2^n}{3^n}$

### Questions (2)

 10 Proof that if $a_1=1$ and $a_{n+1}=1+\frac{1}{1+a_n}$ 9 Integer solutions of the factorial equation $(x!+1)(y!+1)=(x+y)!$

### Tags (104)

 63 calculus × 36 27 trigonometry × 21 40 real-analysis × 24 24 inequality × 13 34 limits × 16 21 derivatives × 11 33 integration × 12 17 algebra-precalculus × 18 29 elementary-number-theory × 9 17 proof-verification × 6

### Bookmarks (75)

 466 Best Sets of Lecture Notes and Articles 184 How to define a bijection between $(0,1)$ and $(0,1]$? 114 Are all limits solvable without L'Hôpital Rule or Series Expansion 93 Can the golden ratio accurately be expressed in terms of $e$ and $\pi$ 46 What is wrong with this fake proof $e^i = 1$?