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45m
comment How can I show that these integrals are zero
we can use mathworld.wolfram.com/WernerFormulas.html
1h
answered Finding limits without l'Hopital
1d
answered Integration of $4xe^{-1/2}$
1d
comment Write $\sum_{k=0}^{\infty} \cos(k \pi / 6)$ in form $a+bi$
See math.stackexchange.com/questions/117114/…. But $$|e^{ia}|=1\not<1$$ So, we can not apply en.wikipedia.org/wiki/…
1d
comment How to prove that $8^{18} - 1$ is divisible by $7$
Use math.stackexchange.com/questions/188657/…
1d
comment Find the limit of a sequence $(\frac{z^n}{n!})_{n=1}^{\infty}$
$$e^x=\sum_{r=0}^\infty\frac{x^r}{r!}$$
1d
answered Verify proof that ${p \choose r} ≡ 0 \pmod p$
1d
answered How to find the exact value of $\tan(\sec^{-1} 4)$?
1d
comment Proof with GCD(m, n)
Related : math.stackexchange.com/questions/7473/…
1d
answered summation and product of sin and cos
2d
comment Simplifying fractional exponents
@paulpaul1076, wolframalpha.com/input/?i=%28-1%29^{\frac26} and wolframalpha.com/input/?i=%28-1%29^{\frac13}
2d
comment Simplifying fractional exponents
See math.stackexchange.com/questions/956541/what-is-8-frac23
2d
comment Theorem of the convergence of the series of fourier!
@malloc, See math.stackexchange.com/questions/117114/…
2d
comment How to prove that $\gcd(2n+3, 3n+1)$ divides $7$?
@user2803048, How about this?
2d
answered How to prove that $\gcd(2n+3, 3n+1)$ divides $7$?
2d
comment How to evaluate $\lim_{x \to 0} ( \ln(1 - \sin x) + x)/x^2$ without using l'Hôpital?
@DrunkCat, An almost exhaustive list of Series Expansion is available here : mathworld.wolfram.com/SeriesExpansion.html
2d
answered How to evaluate $\lim_{x \to 0} ( \ln(1 - \sin x) + x)/x^2$ without using l'Hôpital?
2d
comment How do you cancel the common factor of $\frac{\sqrt[3]{x}+2\sqrt{x}-3}{x-1}$
$6$ came up from the very fact that $6=$lcm$(2,3)$
2d
revised Finding the limit of ${x+\sqrt{x^2-4x+1}}$ at negative infinity
added 141 characters in body
2d
answered Finding the limit of ${x+\sqrt{x^2-4x+1}}$ at negative infinity