This account is temporarily suspended for rule violations. The suspension period ends on May 31 at 13:08.
Reputation
Top tag
Next privilege 5 Rep.
Participate in meta
Badges
5 28 61
Newest
 Nice Answer
Impact
~833k people reached

Apr
7
comment How to compute this double integral
Try to change to polar coordinates.
Apr
7
revised Solve this system of equations using elimination for $x(t)$ and $y(t)$
edited body
Apr
7
comment Solve this system of equations using elimination for $x(t)$ and $y(t)$
@Moo typos are expected! The most important thing is the idea and the techniques! Th OP has to take care of these things!!
Apr
7
comment Solve this system of equations using elimination for $x(t)$ and $y(t)$
@downvoter it is corrected!
Apr
7
comment Solve this system of equations using elimination for $x(t)$ and $y(t)$
@Moo Yes it should be! Thanks for the comment.
Apr
7
revised Solve this system of equations using elimination for $x(t)$ and $y(t)$
Correction
Apr
7
answered Solve this system of equations using elimination for $x(t)$ and $y(t)$
Apr
7
comment If $n\in N$ and $f(x)=\ln(1+x^{2n})$, then derivative $f^{(2n)}(-1)=0$.
That's the only try!
Apr
6
comment Prove $f$ is not differentiable at $(0,0)$
Have you checked your notes about the differentiability of a function of two variables?
Apr
6
comment Linear transformation of a subspace
The image of $A$ is $4x+7y+9z=0$.
Apr
6
answered variation of parameters leads to improper integral
Apr
5
comment Asymptotic behaviour of the integral
Make the change of variables $u=zx$ and you will be able to evaluate the integral in terms of gamma function and things will be clear.
Apr
5
comment Derivative of definite integrals with interval variables inside the integral i.e.: $ \frac{d}{dx} \int_a^x{(x-t)^n f^{(n+1)}(t)}dt $
You should have the answer $$\Gamma(n+1)(f'(x) + p_{n-1} ( x-a). $$ where $p_{n-1} $ is a polynomial of degree $n-1$.
Apr
4
comment Definite Integral $\int_0^1 \left \{\frac{(-1)^{\lfloor 1/x \rfloor}}{x} \right\}\, dx$
You can use the techniques I gave here.
Apr
2
comment Evaluate the integral using the theory of residues: $\int_0^{2\pi} \frac{(\cos \theta)^2 d \theta}{3-\sin \theta}$
Put $z=e^{i\theta} $ and consider the integral $\int_{|z|=1} f(z) dz$.
Apr
1
comment Improper integral.
This question has been asked several times on this website! One technique is to make a change of variables $u=\ sin x$ and then you can relate the new integral to beta function!
Mar
30
comment Show that $f *g \in C(\mathbb{T})$ for $f \in L^p(\mathbb{T})$ and $g \in L^q(\mathbb{T})$ by minkowski integral inequality
Writing is not clear!
Mar
30
comment Uniform convergence on a closed interval - power series
The series converges uniformly on any compact set within its radius of convergence.
Mar
29
comment Solve for $x$ using the lambert W function $ \frac{\ln(1+bx)}{x} = a$
@Did I think you have a serious problem with my answers! I can not helped it!
Mar
29
comment If $\{u, v\}$ is an orthonormal set, how is $\|u - v\| = \sqrt{2}$?
It should be $u. v=0$