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Mar
30
revised $(\delta,\varepsilon)$ Proof of Limit
added 16 characters in body; edited title
Mar
20
comment Evaluate $\int \frac{1}{x^3+3x+1}dx$
Which is what exactly? When you learn\teach Calculus 1, do you talk about $\log(x-2i+3)$?
Mar
20
comment Evaluate $\int \frac{1}{x^3+3x+1}dx$
Indeed it is - but you need to know complex integration for that
Mar
20
comment Evaluate $\int \frac{1}{x^3+3x+1}dx$
Only one of them is real...
Mar
20
answered Evaluate $\int \frac{1}{x^3+3x+1}dx$
Mar
20
comment Evaluate $\int \frac{1}{x^3+3x+1}dx$
@Power: Are you sure that it is $x^3$ in the denumerator?
Feb
24
answered If a normal subgroup of a symmetric group contains a transposition. Prove that the normal subgroup is the entire symmetric group.
Feb
22
answered Why $(f(-x)) ^\prime=-f ^ \prime(-x)$?
Feb
12
awarded  Yearling
Feb
8
awarded  Enlightened
Feb
8
awarded  Nice Answer
Jan
20
comment When do two matrices have the same column space?
Use column operations to get to the reduced form - in the columns
Jan
6
answered $t^2y'' - 3ty' + 4y = 0$, how do you solve for $y$ in terms of $t$?
Jan
5
comment Sum of the series $\sum_{i=1}^n a^i i^r$
That's a finite sum, not series... What is $r$?
Dec
22
awarded  Constituent
Dec
16
awarded  Caucus
Dec
2
answered 2 question about power rules from a test i had today
Nov
24
revised Placing 5 pieces on a 5x5 grid with no main diagonal
added 108 characters in body
Nov
24
awarded  Nice Answer
Nov
24
answered Placing 5 pieces on a 5x5 grid with no main diagonal