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 Feb17 accepted Computing $\int_{0}^{1} x \ln(1+\sqrt{1+x^2}) dx$ Oct21 accepted Solve $x^2 = I_2$ where x is a 2 by 2 matrix Oct20 accepted How to solve step by step $\frac{2n+1}{n+2} < 8$ Feb8 accepted How many words can be obtained using 2n letters? Dec2 accepted Preservation of surjectivity when composing functions Dec2 accepted Help in understanding integration by changing the variable Nov4 accepted Complex number modulus inequality Oct3 accepted How to figure out x and y components of a vector Sep4 accepted What does it intuitively mean that the divergence of a vector field is 0? Aug28 accepted Calculus proof for the area of a circle Aug22 accepted A little help with algebra (homework) Aug20 accepted Derivative of step functions Aug19 accepted Is there a non-contradictory non-trivial axiomatic system in which Gödel's theorem is undecidable? Aug13 accepted Question about continuous functions and indefinite integrals Jan11 accepted I want to study mathematics ahead of high school, but I found that I'm rusty on the elementary stuff Jan10 accepted How to solve equations with absolute value and using the Archimedean property