Chinny84's user avatar
Chinny84's user avatar
Chinny84's user avatar
Chinny84
  • Member for 10 years, 7 months
  • Last seen this week
  • London,uk
37 votes
Accepted

Difference between Variance and 2nd moment

13 votes
Accepted

proof for $\frac{1}{i} = -i$?

13 votes

How to differentiate $\lim\limits_{n\to\infty}\underbrace{x^{x^{x^{...}}}}_{n\text{ times}}$?

10 votes
Accepted

Differential Equation $\ln(y') = x - y - e^y$

10 votes
Accepted

Sum of the series $\sum_{n=1}^\infty n^2e^{-n}$

9 votes

$\int \frac{dx}{x+\sqrt{x}}$

8 votes
Accepted

What does the slope of a log-log plot represent?

7 votes
Accepted

Trying to prove a trigonometric identity

7 votes

Integral of exponential with $x(1-x)$ term

7 votes

Find two positive integers $x$ and $y$ such ...

7 votes
Accepted

How to solve this kind of nonlinear differential equation?

6 votes
Accepted

Make x the subject given the formula for y

6 votes
Accepted

To solve $y'=\frac{\cos y+y\cos x}{x\sin y-\sin x}$

6 votes
Accepted

Solving $xy''-(1-x)y'+y=0$

6 votes

Finding solution for ${y}''=-9y$

6 votes
Accepted

How to solve $\int \frac{1}{\sqrt{\frac{C}{x^2}-1}}\;dx\;\;$

6 votes

Evaluate the following integral: $ \int \frac{x^2\arctan x}{1+x^2}\ \mathrm{d}x$

6 votes

Find the Inverse of this function: $y= \frac{1-\sqrt{x}}{1+\sqrt{x}}$

6 votes
Accepted

Need directions to solve this ODE : $\frac{dy}{dx} +\tan{y}=\frac{x}{\cos{y}}$

5 votes

Find $\int \frac{\sqrt{x^2+1}(\ln(x^2+1)-2\ln(x)) }{x^4}\,dx $

5 votes

solving difficult complex number proving

5 votes
Accepted

Solving $x^y = y^x$ analytically in terms of the Lambert $W$ function

5 votes
Accepted

Laplace equation in a circle - where is my mistake

5 votes
Accepted

Solving the ODE $xu'' + 2u' = 0$

5 votes
Accepted

Is $\frac{\partial}{\partial x} f(x-y) = - \frac{\partial}{\partial y} f(x-y)$?

5 votes

Show that $ \lim_{n \rightarrow \infty} \frac{n!}{2^{n}} = \infty $

5 votes
Accepted

$y''+y'^{2}+y=0$ equation solution

5 votes
Accepted

How to solve $y'=\frac{x^2+y^2}{x^2-y^2}$?

5 votes
Accepted

Differential equation: $A(x)y''(x)+A'(x)y'(x)+y(x)/A(x)=0$

5 votes

What is the sum of $\sum_{n=1}^\infty (n^2+n^3)x^{n-1}$?

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