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Feb
22
revised To get addition formula of $\tan (x)$ via analytic methods
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Feb
21
answered To get addition formula of $\tan (x)$ via analytic methods
Feb
19
comment To get addition formula of $\tan (x)$ via analytic methods
Do we know $\tan(x) = \frac{\sin(x)}{\cos(x)}$, $\sin^2(x) + \cos^2(x) = 1$ and $\cos(x+y) = \cos(x)\cos(y) - \sin(x)\sin(y)$?
Feb
12
reviewed Reviewed Create asymmetric 3D function by revolving a 2D function around an axis
Feb
12
comment PDE method of characteristics solving $e^{t^2}u_t+tu_x=0$ with $u(x,0)=x+2$
@user61933 I've edited the answer in order to address your questions. Please, if you find it appropriate, vote up and accept the answer.
Feb
12
revised PDE method of characteristics solving $e^{t^2}u_t+tu_x=0$ with $u(x,0)=x+2$
added 524 characters in body
Feb
12
answered PDE method of characteristics solving $e^{t^2}u_t+tu_x=0$ with $u(x,0)=x+2$
Feb
12
revised PDE method of characteristics solving $e^{t^2}u_t+tu_x=0$ with $u(x,0)=x+2$
texified it
Feb
12
reviewed Reviewed Construct a convergent series of positive terms with $\displaystyle\limsup_{n\to\infty} {a_{n+1}\over{a_n}}=\infty$
Feb
12
comment PDE method of characteristics solving $e^{t^2}u_t+tu_x=0$ with $u(x,0)=x+2$
I added $\LaTeX$ to your question. Please verify it's correct.
Feb
12
suggested approved edit on PDE method of characteristics solving $e^{t^2}u_t+tu_x=0$ with $u(x,0)=x+2$
Feb
12
revised Does the limit as $(x,y) \to (1,2)$ of $3x^3-x^2 y^2$ exist?
texified it
Feb
12
suggested approved edit on Does the limit as $(x,y) \to (1,2)$ of $3x^3-x^2 y^2$ exist?
Jan
30
revised Integral using residue theorem (maybe)
edited tags
Jan
30
answered Integral using residue theorem (maybe)
Jan
30
comment Diff eq. transformation polar coordinates
Two things. Your notation is obscure, as $t$ is function of the variable of integration, i.e. $\frac{d t}{d \xi} \equiv {t}'$, hence you are using the chain rule wrong; also, the cubic term on the second component of your substitution should read $-r^3 \sin t$. See my answer for details.
Jan
30
answered Diff eq. transformation polar coordinates
Jan
14
comment How to find the following derivative?
@LanceFerd It's the domain of definition for $\arcsin t$, i.e. the range where $\sin x$ is invertible -in the principal branch, that is-.
Jan
14
comment How to find the following derivative?
@LanceFerd One has to be carefull when taking root of a squared function: $$\sqrt{f^2(x)} = \big|f(x)\big|.$$ See my answer for details.
Jan
14
revised How to find the following derivative?
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