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May
2
comment Calculating this integral: $I=\int_{0}^{\infty}(\log t)\,(\tan^2t)\,\mathrm{d}t$
You have bounds $0$ and $\infty$ in the title but some other numbers in the body, which is it?
Apr
11
revised Minimum number of combinations
added 974 characters in body
Apr
11
answered Minimum number of combinations
Apr
10
comment Help with this combinatorial proof $\sum\limits_{k=1}^nk^2(k-1){n\choose k}^2 = n^2(n-1){2n-3\choose n-2}$ considering $n\ge2$
Where did you get this formula? left-hand side gives $480$ and right hand side gives $160$ for $n=4$...
Apr
10
comment What does this equal? $6\div 2(1+2)$
how does someone get $7$?
Apr
10
reviewed Approve Sudoku candidate probability
Apr
10
comment Are the two integrals equivalent?
Yes they are indeed the same
Apr
9
reviewed Edit Is my second equation right?
Apr
9
revised Is my second equation right?
Use Mathjax
Apr
9
reviewed Approve How to use the Maclaurin Series to get $f^{10}(0)$ of $f(x)=(\cos(3x^2)−1)/x^2$
Apr
9
reviewed Reject Finding the point on the curve at which the normal is parallel to a given line.
Apr
9
revised Convert from base 10 to base 5
improved formatting
Apr
9
awarded  Enlightened
Apr
9
awarded  Nice Answer
Apr
8
revised Convert from base 10 to base 5
added 142 characters in body
Apr
8
answered Convert from base 10 to base 5
Apr
5
answered What is the probability that you will see an odd number of heads?
Apr
1
answered What is the legality of the following series?
Mar
31
comment $f(x)=x$ if $x$ is rational , $f(x)=1-x$ if $x$ is irrational, at what point this function is continuous?
You beat me to it, +1
Feb
26
comment Finding out the coeffcient next to $x^2$ in $(\cdots(x-2)^2-2)^2\cdots-2)^2$.
I don't know why it is, but it seems the recurrence is $a(n)=20a(n-1)-64a(n-2)$, which gives the solution $(4*16^n-4^n)/3.$