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 Dec 9 reviewed Approve $\lim_{x \to \infty} \frac{\sqrt{x^2 - 4}}{2x+1}$ Nov 29 reviewed Approve Ellipse by moving center of a parametric circle equation? Jan 7 reviewed Approve How can I show that $\lim_{n\to\infty} 2^n \left( \frac{n}{n+1} \right ) ^{n^2} = 0$? Oct 21 reviewed Approve Implicit Differentiation and Tangent Lines (sin and cos) Oct 18 reviewed Approve Integral of $\int_0^{2\pi} \frac{e^{-it }dt}{e^{it}-z}$ Oct 17 reviewed Approve How to find the 4th degree polynomial with given values at $0,1,2,3,4$? Oct 9 reviewed Approve Reducing differential equation $\frac{\operatorname d \!y}{\operatorname d \!x} = \frac{(x+y)^2 }{(x+2)(y-2)}$ Apr 16 reviewed Reject Calculate $\int_0^1 \frac{\ln(1-x+x^2)}{x-x^2}dx$ Apr 12 reviewed Approve Finding the radius of a sphere touching other spheres inscribed in n-dimensional spaces Apr 11 reviewed Approve If $2$ divides a number $a$, does $2^n$ divide $a$ ? $n$ is any integar Mar 30 reviewed Reject Evaluate the limit Mar 22 reviewed Approve one bounded and one 0 is 0 Mar 20 reviewed Reject If $A \cdot x \leq b$, what values should A and B take so that $2<[x1,x2]<20$ Mar 16 reviewed Reject Difficult integral, and I don't know how to even start Mar 15 reviewed Reject How are the Taylor Series derived? Mar 13 reviewed Reject Does an equation containing infinity not equal 0 or infinity exist? Mar 9 reviewed Reject Two non isomorphic algebraic varieties Mar 9 reviewed Approve Mean Value related problem. Mar 9 reviewed Approve $x^2-1$ with prime factors < 100 Mar 9 reviewed Approve How to find out the real part of this.