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A second-year student.

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  • Last seen Jun 27 '20 at 2:35

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16 Is there a way to draw a 1 degree angle using only ruler and compass? Jun 2 '16
15 What does this (double absolute value like) notation mean? Mar 21 '16
7 Is it possible to write $\tan^{-1}(x)$ as a power series of $\tanh(x)$? [duplicate] Jan 6 '17
6 How can a $\sin x$ come out of the equation $\frac{d^2}{dx^2}f(x)=-f(x)$ as the solution, while there's no sign of a trigonometric function in it? Jul 7 '16
5 How to calculate $3*5*17*257-3^{16}$ using factorization formulas? Feb 12 '15
5 How to factorize $n^5+n+1$? Feb 13 '15
5 how to factorize $x^2+10yz-2xz-2xy-3y^2-3z^2$? Apr 6 '15
4 Does $A \times B \times C$ make sense? ($\times$: the Cartesian product) Apr 11 '18
3 Prove by contradiction that any prime number is either in the from of $ab+1$ or $ab+5$. [duplicate] Jan 10 '17
3 If $a$ is a repeating decimal, when is $c a$ a terminating decimal? $c\in \mathbb{Z}$ Jan 5 '17
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