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 Jan31 revised Trigonometric integral (arctg) added 13 characters in body Jan24 revised The meaning of dot centered vertically, as in $3\cdot 5$ added 12 characters in body Jan20 revised Solving $x\frac{\partial u}{\partial x} + y\frac{\partial u}{\partial y }=1$ deleted 19 characters in body Jan20 revised Closed form for $\prod_{k=1}^n (a+k^2)$ edited body Jan20 revised Closed form for $\prod_{k=1}^n (a+k^2)$ deleted 2 characters in body Jan20 revised Expansion Of A algebric term added 80 characters in body; edited tags Jan20 revised Finding the definite integral of a function that contains an absolute value added 227 characters in body Jan18 revised Is there a name for functions “opposite in nature” to orthogonal functions? edited tags Jan18 revised Examples of orthogonal/orthonormal functions which are not finite degree polynomials? edited tags Jan17 revised Examples of orthogonal/orthonormal functions which are not finite degree polynomials? added 1 character in body Jan17 revised Examples of orthogonal/orthonormal functions which are not finite degree polynomials? added 64 characters in body Jan17 revised Examples of orthogonal/orthonormal functions which are not finite degree polynomials? added 57 characters in body Jan17 revised Examples of orthogonal/orthonormal functions which are not finite degree polynomials? edited title Jan13 revised The gradient of a distance function. added 22 characters in body Jan11 revised Find appropriate substitution for indefinite integral. edited body Jan8 revised How to calculate $\int_0^1 \frac{(1+x)^{2r-1}}{1+x^2}dx$? added 71 characters in body Jan8 revised How to calculate $\int_0^1 \frac{(1+x)^{2r-1}}{1+x^2}dx$? added 5 characters in body Dec20 revised Could “$\infty$” be understood by taking the reciprocals of the Hyperreal numbers? edited title Dec20 revised Could “$\infty$” be understood by taking the reciprocals of the Hyperreal numbers? deleted 38 characters in body Nov20 revised Finding the roots of $x^2+(3+5i)x+(7+11i)=0$ added 542 characters in body