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 3h reviewed Leave Closed Find the values of $c$ that satisfy the Mean Value Theorem 3h reviewed Leave Closed Proving trigonometric identity $\frac{1+\sin x}{1-\sin x}-\frac{1-\sin x}{1+\sin x}=4\sec x \tan x$ 5h reviewed Leave Closed Why is unit circle not sufficient to bound the partial sums? 5h reviewed Reopen prove that $x^2 + 5 =y^3$ has no solutions for $x,\ y \in \mathbb{Z}$ 5h reviewed Leave Closed Doubt in combination 17h reviewed Leave Closed Coupon collector variation (with deleterious coupons and tolerance) 1d reviewed Leave Closed Number theory - Primitive roots and residue 1d reviewed Leave Closed Covariance inequality for infinitely many exchangeable random variables 1d reviewed Leave Closed What is the easiest way to rearrange a formula to change the subject? 1d reviewed Leave Closed Finite abelian group - product of its elements 2d reviewed Leave Closed Mathematical proof of the emergence of graph pattern Apr15 reviewed Leave Closed Covariance inequality for $n$ exchangeable random variables Apr15 revised Nobody can help me ? I can't believe that… edited tags Apr14 reviewed Reopen If $AB$ has zero trace for every matrix $B$ of zero trace, then $A$ is a scalar matrix Apr14 reviewed Leave Closed Calculus graphing question. Apr14 reviewed Leave Closed If $ab = cd$ then $a^2 + b^2 + c^2 + d^2$ is composite Apr14 reviewed Leave Closed Maximizing xy subject to x+y <= a x>0 and y>0, using Hessian to check concavity of f Apr14 reviewed Leave Closed Binary Integer Programming with one nonlinear constraint Apr14 reviewed Leave Closed How to write an “infinity” matrix Apr14 reviewed Leave Closed Probability that random walkers meet