# Mario De León Urbina

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bio website location Costa Rica age 25 member for 2 years, 8 months seen yesterday profile views 229

I'm bachelor of Math Teaching and Economics student in the UCR. I love maths. $\sqrt { God} = love$

# 19 Questions

 30 What is the larger of the two numbers? 6 Teaching irrational numbers? 6 Show that $\int_0^\infty e^{-x^2} \sin{2xb}\, dx =e^{-b^2}\int_0^b e^{x^2} \, dx, \, b>0,$? 5 Odd Binomial Coefficients? 4 What's $F'(x)$ if $F(x) = \int_a^{g(x)} H(x,t) dt$?

# 699 Reputation

 -2 The ratio of two numbers is $7$ to $5$. The sum of the numbers is $24$. What are the numbers? +10 Teaching irrational numbers? +5 What's the limit of the sequence $\lim_{n \rightarrow \infty} \frac{n!}{n^n}$? +10 Prove $2^n\cdot n! ≤ (n+1)^n$ by induction.

 4 Prove that $\displaystyle \lim\limits_{n \rightarrow \infty} \left(\frac{23n+2}{4n+1}\right) = \frac{23}{4}$. 4 Prove that if $x$ is a non-zero rational number, then $\tan(x)$ is not a rational number and use this to prove that $\pi$ is not a rational number. 2 The ratio of two numbers is $7$ to $5$. The sum of the numbers is $24$. What are the numbers? 2 How to factorize $2x^2+5x+3$? 1 Prove $2^n\cdot n! ≤ (n+1)^n$ by induction.

# 45 Tags

 10 algebra-precalculus × 10 4 pi 9 real-analysis × 12 4 alternative-proof 5 limits × 4 2 homework × 8 4 trigonometry × 2 2 inequality × 3 4 proof-verification 2 calculus × 3

# 6 Accounts

 Mathematics 699 rep 310 Christianity 183 rep 7 TeX - LaTeX 101 rep 1 English Language & Usage 101 rep 1 Physics 101 rep 1