Pragabhava
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 Feb 22 revised To get addition formula of $\tan (x)$ via analytic methods added 2546 characters in body 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? added 116 characters in body