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 Aug10 revised Is there a symbol that I can attach to a pair of line segments which are parallel and equal length? added 104 characters in body Jul28 revised How to find the intersection points of lines that are normal to two curves? added 182 characters in body May7 revised Functions Question Completing the math markup. May6 revised How to determine the coordinate of roller coaster's wheels? added 366 characters in body Mar15 revised Integral by parts of this function added 41 characters in body Feb10 revised How to prove the number of images of two mirrors inclined at $A$ is $360/A -1$ edited body Jan21 revised How to find the closed solution for the following recursive vector equations? added 50 characters in body Dec3 revised How to prove by contradiction that there is only one circle with the given segment AB as its diameter? deleted 669 characters in body Dec3 revised How to prove by contradiction that there is only one circle with the given segment AB as its diameter? added 677 characters in body Nov20 revised What is the explicit formula for the sequence representing the number of any triangles in a triangular grid? deleted 174 characters in body Nov20 revised What is the explicit formula for the sequence representing the number of any triangles in a triangular grid? deleted 36 characters in body Nov20 revised What is the explicit formula for the sequence representing the number of any triangles in a triangular grid? added 297 characters in body Nov6 revised How to solve $7200a+720b+72c=1000x+340+y<10000$? Fixing a typo. Oct30 revised How to analytically prove that the area of a closed curve is conserved under “tearing-and-reattaching” transformation? added 75 characters in body Oct25 revised Proof of $(\forall x)(x^2+4x+5 \geqslant 0)$ added 116 characters in body Oct6 revised How to find the general solution of $\tan \left(x+\frac{\pi }{3}\right)+3\tan \left(x-\frac{\pi }{6}\right)=0$ Adding a spoiler to the image to make it more fancy. :-) Oct6 revised How does the author get from one step to another? added 167 characters in body Oct6 revised How does the author get from one step to another? added 80 characters in body Oct5 revised Riddle: 1 question to know if the number is 1, 2 or 3 added 310 characters in body Oct4 revised Riddle: 1 question to know if the number is 1, 2 or 3 edited body