Reputation
149,481
Next tag badge:
98/100 score
29/20 answers
Badges
11 114 203
Impact
~1.7m people reached

Feb
4
revised $z^n=(i+z)^n$, solve for $z$
added 165 characters in body
Feb
4
comment $z^n=(i+z)^n$, solve for $z$
@Dr.MV, that is clear from the last line
Feb
3
comment I want to solve $\int \frac{2}{x^2(x^2+1)^2}dx$
Try setting $$x=\tan y$$
Feb
3
awarded  Favorite Question
Feb
3
answered Find $\lim\limits_{x\to 0}\frac{\sqrt[]{\cos x}-\sqrt[3]{\cos x}}{\sin^2 x}$ using Maclaurin series
Feb
3
answered $z^n=(i+z)^n$, solve for $z$
Feb
3
comment What is the simplest way to show that ${(p-1)! \over (k)!(p-k)!}$ is an integer?
Use math.stackexchange.com/questions/11601/…
Feb
3
answered How can I solve $\int \frac{3x+2}{x^2+x+1}dx$
Feb
3
answered quadratic simultaneous equation
Feb
3
answered quadratic simultaneous equation
Feb
2
comment Why are some solutions excluded if we simply multiply the denominator in an fraction inequality?
@BogdanPop, $x=-2\iff3x-1<0$ For $3x-1<0$ $$\dfrac{2x-5}{3x-1}\ge1\iff2x-1\le-(3x-1)$$
Feb
2
answered Why are some solutions excluded if we simply multiply the denominator in an fraction inequality?
Feb
2
comment Finding the square root of $6-4\sqrt{2}$
$$2^2+(\sqrt2)^2-2\cdot2\cdot\sqrt2=(2-\sqrt2)^2$$
Feb
2
comment Range of inverse harmonic mean of two integers
See math.stackexchange.com/questions/840720/qm-am-gm-hm-proof-help
Feb
2
answered Find the value of $x$ which is correct
Feb
2
comment How to show that $(X-a)^+\le X^++|a|$
$$|-a|=|a|$$ and $$|x+(-a)|\le|x|+|-a|$$
Feb
1
comment Let $f(x)=p\cos x+q\sin x,|p|+|q|\ne0$ and $|f(x)|\leq 1$.Let $\alpha,\beta$ be the roots of the equation $f(x)=1,|\alpha-\beta|=k\pi,k\in R,$
What is the source of the problem?
Feb
1
answered How to prove this? $\lim_{h \to 0} \frac{\sin(\theta+h)-\sin(\theta)}{\cos(\theta+h)-\cos(\theta)} = -\frac{1}{\tan(\theta)}$
Feb
1
answered Find the remainder when ${{5^5}^5}^5$ is divided by $24$
Jan
31
answered $f(x) - f'(x) = x^3 + 3x^2 + 3x +1; f(9) =?$