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visits member for 2 years, 6 months
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1h
comment Evaluating $\int{\frac{1}{\sqrt{x^2-1}(x^2+1)}dx}$
@Parhs, They have used $2\log(a)=\log(a^2)$
1h
comment Proving an identity in a regular Heptagon
I'll be really surprised if this can be done without using sine law
3h
comment Solutions of $z^6 + 1 = 0$
@quid, This pattern, will not allow the fuss due to solving in algebraic way
6h
comment How to add a sum of sines with general form $\frac{(4n-2)\pi}{23}$ between $1$ and $11$?
See math.stackexchange.com/questions/17966/…
7h
comment Multi Variable Partial Fraction Problem
@sanddy1911, Why remainder? Do you know how to find arbitrary constants from Partial Fraction Decomposition?
7h
answered Integration without complex analysis on rational-improper integral
8h
comment Multi Variable Partial Fraction Problem
@sanddy1911, Set $x=a,b$ to find $C,B$ respectively. Then comparing the constants of both sides of the identity, $-\alpha\beta\gamma=Aab-aC-bB$
8h
revised Multi Variable Partial Fraction Problem
added 194 characters in body
8h
answered Multi Variable Partial Fraction Problem
8h
answered Solutions of $z^6 + 1 = 0$
8h
comment Integration without complex analysis on rational-improper integral
Can you start with $x=\dfrac1y$?
10h
answered Congruence with binomial
1d
comment The sequence of improper integrals of the form $\int\frac{dx}{1+x^{2n}}$
Set $x=\tan\theta$ and use sosmath.com/CBB/viewtopic.php?t=10932
1d
comment If given $\sum_{r=1}^{m-1}\binom r3$, how does the summation evaluate when $n<r$ in $\binom nr$?
$$\binom nr=0$$ for $r<0,r>n$
1d
answered Extending Euler's Theorem gives minus 1 - why?
1d
answered Find an arithmetic sequence which…
1d
comment Solve the equation $2x^2+5y^2+6xy-2x-4y+1=0$
@ClaudeLeibovici, Very natural solution $(+1)$
1d
comment How to prove taht a product of two complete residue system is not a complete residue system?
Related : math.stackexchange.com/questions/381268/…
1d
comment Quadratic Expressions: Advanced techniques of Integration
@Hurkyl, I showed that the sign must be minus between $9,(3x-2)^2$
1d
comment Quadratic Expressions: Advanced techniques of Integration
@Hurkyl, Please pinpoint the mistake