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 Apr20 asked Taylor expansion of a not easily differentiable function Apr13 comment Difficult Improper Integral What's so terrible about $\frac{114}{19}$? Apr6 revised How do I solve this indeterminate limit without the L'hospital rule? latex Mar30 awarded Quorum Mar29 reviewed Approve About $\lim_{x\rightarrow 0}\frac {\sin x}{x} = 1$ Mar13 reviewed Approve $SO(n)$ is connected Mar12 reviewed Approve Should an undergrad accept that some things don't make sense, or study the foundation of mathematics to resolve this? Mar6 reviewed Approve Solve the differential equation: $(y^2-xy)dx+x^2dy=0$ Feb28 revised Integrating $f(y) = e^{-y} y^3$ wrong variable name Feb28 reviewed Approve If $x=1\mod3$ and $x=0\mod2$, what is it $\mod6$? Feb26 reviewed Reject Multiplying matrices of matrices Feb24 reviewed Approve Indefinite Integral $\int \sin (x) \ln (\tan (x))dx$ Feb24 answered Solving $\int\sqrt{1+(-2ax+b)^2}\;dx$ Feb20 answered $\lim_{(x,y) \to(0,0)}\sin(x - y)$ Feb12 awarded Notable Question Feb9 reviewed Approve Is there a method to memorizing $\pi$? Feb9 answered How to solve $L = (1.463 \cdot 10^7R^2)/(F^2V) - 1.463R$ for $R$? Feb6 comment For which constants does the following converge to a delta function? Depending on your definition of a delta function this may not be possible, since the integral of your function over $\mathbb{R}^2$ doesn't converge for any $n$, no matter what $c_n$ is. As far as I know, the delta function must verify $\int_\mathbb{R} \delta(x)\ dx = 1$. Feb5 answered Evaluating $\int \frac{1}{\sqrt{x^2 + a^2}}\, dx$ without resorting to trigonometric $u$-substitution Feb5 comment Evaluating $\int \frac{1}{\sqrt{x^2 + a^2}}\, dx$ without resorting to trigonometric $u$-substitution Would you accept hyperbolic functions? :)