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Aug
20
comment How to solve $\int \frac{\tan^{-1}x}{(1+x)^2}dx$?
$\tan^{-1}(x)$ is an $\arctan(x)$, yes?
Aug
19
answered Evaluate $\int_2^4\frac{\sqrt{x^2-4}}{x^2}\mathrm dx$
Aug
19
answered Is there any simple analytic method for solving $\sqrt{x}+y=7$ and $x+\sqrt{y}=11$ simultaneously.
Aug
19
revised Is there any simple analytic method for solving $\sqrt{x}+y=7$ and $x+\sqrt{y}=11$ simultaneously.
improved formatting
Aug
19
suggested suggested edit on Is there any simple analytic method for solving $\sqrt{x}+y=7$ and $x+\sqrt{y}=11$ simultaneously.
Aug
17
suggested suggested edit on Probability Distribution, where $E(X^2) = 2E(X)$
Aug
17
revised Relation between $\dim V$ and $\dim V^{\star}$
improved math formatting
Aug
17
suggested suggested edit on Relation between $\dim V$ and $\dim V^{\star}$
Aug
17
revised Equation of parabola with focus and tangent
improved overall formatting
Aug
17
suggested suggested edit on Equation of parabola with focus and tangent
Aug
17
answered How Matrix A is called $A^2=I$
Aug
17
comment How Matrix A is called $A^2=I$
Involutory matrix.
Aug
17
comment How Matrix A is called $A^2=I$
Equal to identity matrix? I know about nilpotent, idempotent and periodic matrices.
Aug
17
comment Calculus of variations: big-O notation?
Just replacement of terms smaller than $C^2$ with $O(C^2)$, assuming $C$ is small.
Aug
17
comment Calculus of variations: big-O notation?
You have particular question on something or overall explanation? For last, some calculus textbook would be better.
Aug
17
comment May seem like a noob question: really, why can't we divide by 0?
Maybe because it can be defined in many different ways and none of this definitions would be useful. Unlike $1+2+\cdots=-1/12$, where multiple definitions yields to the same result and have a practical results.
Aug
16
revised Finding $p'(0)$ for the polynomial of least degree which has a local maximum at $x=1$ and a local minimum at $x=3$
fixed formatting
Aug
16
suggested suggested edit on Finding $p'(0)$ for the polynomial of least degree which has a local maximum at $x=1$ and a local minimum at $x=3$
Aug
16
revised A $n\cdot n$ square grid problem?
improved overall formatting
Aug
16
suggested suggested edit on A $n\cdot n$ square grid problem?