# GTX OC

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 4 Is making vectors a good way to determine the coplanarity of 4 points? 4 What's the domain of $\ f(x) = \sqrt{\frac{x - 3}{x - 5}}$? 3 Finding the limit as $x$ goes to $a$ of $\log(x-a)$ 3 Find $z$ such that $|z+1|+ |z-1|=4$ 3 Poems related to mathematics

# 1,041 Reputation

 +15 A question of straight lines -2 Coefficeient of $x^k$ in $(1+x)^n$ when $n<0$ +5 Evaluate $\lim_{x\rightarrow 0 } \frac{(1+x)^{\frac{1}{x}}-e}{x}$ +10 Minimum of a sum

# 24 Questions

 3 How do I prove that the series $\sum_{n=1}^\infty \frac{1}{n}$ diverges? [duplicate] 2 Compute the integral $\int\frac{e^x}{x}\mathrm dx$ 2 Technique to solve this equation of 2 unkowns 2 Limit $\lim (\frac{n!}{n^n})^{\frac{1}{n}}$ [duplicate] 2 Evaluate $\lim_{x\rightarrow 0 } \frac{(1+x)^{\frac{1}{x}}-e}{x}$

# 66 Tags

 11 calculus × 18 6 functions × 5 8 integration × 7 5 absolute-value × 2 8 limits × 6 4 vectors × 3 7 algebra-precalculus × 10 3 real-analysis × 7 6 derivatives × 7 3 sequences-and-series × 5

# 9 Accounts

 Mathematics 1,041 rep 213 Arqade 307 rep 15 Physics 171 rep 5 Super User 111 rep 1 Code Review 103 rep 1