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 Aug 7 accepted Tangent points on circle that placed on Earth surface Aug 7 accepted To find the general formula of $\overbrace{g(g(g(…g(x))}^\text{n}=g_n(x)=\frac{A_{n}.x+B_{n}}{C_{n}.x+D_{n}}$ Nov 16 accepted To find Area of rectangular with given 3 parameters Oct 13 accepted How to find sum of coefficients of $\frac{d^n}{dx^n} \left( Z(x)^m \right)$ Jul 26 accepted To find the volume of the region that is bordered by 4 points in 3D space May 29 accepted To evaluate $\int_0^{+\infty} \frac{\;\mathrm dx}{\sqrt[3]{x^3+a^3}\sqrt[3]{x^3+b^3}\sqrt[3]{x^3+c^3}}$ May 15 accepted Can we prove that all equations can be solved via complex numbers? Oct 6 accepted Euler's infinite product for the sine function and differential equation relation Aug 13 accepted To generalize of Fermat's Last theorem, to find the solution of $a^n+b^n+c^n = d^n$ Jul 9 accepted How can we prove $\pi =1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}-\frac{1}{5}+\frac{1}{6}+\frac{1}{7}+\cdots\,$? Jun 10 accepted To solve $U''_{n}(x)-\frac{2n}{x}U'_{n}(x)+(\frac{2n}{x^2}-1)U_{n}(x)=0$ Apr 22 accepted To check the solution via radicals Apr 11 accepted Prime number generating function as product expansion Mar 14 accepted Differential equation $y'=\frac{1-xy}{y-x^2}$ Feb 25 accepted 2 circles and one ellipse and minimum area problem. Feb 25 accepted To get addition formula of $\tan (x)$ via analytic methods Oct 24 accepted Determine the path that created by a sector of circle Oct 22 accepted How to solve the differential equation $u_k(z)=-2\cfrac{\partial}{\partial z }(\cfrac{u_{k+1}(z)}{z})$? Oct 15 accepted How to solve the recurrence relation of $f_n(x)=A_n(a,b)x+B_n(a,b)f(x)$ Oct 7 accepted Nth derivative of $\tan^m x$