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 Dec 14 answered Prove or disprove the statement: if all the eigenvalues of a matrix are 0, then the matrix must be the zero matrix? Dec 14 asked scores of individuals and evaluation Dec 14 asked distribution of the difference of discrete uniform RVs Dec 8 answered $\cos(x)$ strictly increasing on $(-\pi,0)$ Dec 8 asked $\cos(x)$ strictly increasing on $(-\pi,0)$ Nov 21 asked $\lim_{x \to \infty} x\sin(\frac{1}{x}) = 1$ (epsilon-delta like condition) Sep 17 answered Finding probability given mean and standard deviation Jul 8 answered How to determine if it is l'Hopital's or not? Jun 26 answered How to express $\lnot (a < b < 0)$ or the contrapositive of this statement? Jun 24 answered function, strange formula from Discrete mathematics Jun 24 answered Solving $2x+8=6x-12$ by using the guess and check method Jun 23 answered Proving associativity on $\mathbb{Q}$ Jun 23 answered The chain rule: differentiation in several variables Jun 22 answered How can det(B)=-det(A) when this happens? Jun 20 answered Proof that intersection of two subspaces is {0} Jun 16 answered Hypothesis testing: Test statistic, P-value and significance levels Jun 15 answered simple vector multiplication Jun 14 answered Probability of Either of Two Teams Winning the World Cup Jun 14 answered Method of Lagrange multipliers to find all critical points of a function Jun 12 answered How to draw a distribution of the function?