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 Oct 5 awarded Popular Question Oct 4 awarded Popular Question Sep 30 revised How to go from $d= \left(\frac{A\cdot B}{B\cdot B} B,A \right)$ to $d=\frac{|A\cdot B|}{|B|}$? added 757 characters in body Sep 29 asked How to go from $d= \left(\frac{A\cdot B}{B\cdot B} B,A \right)$ to $d=\frac{|A\cdot B|}{|B|}$? Sep 25 awarded Famous Question Sep 19 asked Is there a problem in using this method to find a tangent line to a function? Sep 17 asked Write $DC\times DA$ in the basis $\{VA,VB,VD \}$? Sep 16 awarded Popular Question Sep 11 comment Proof: There is no bijection from $P(S)\to S$? @Wojowu When he created $F$. There are too many propositions and it confuses me. Sep 11 asked Proof: There is no bijection from $P(S)\to S$? Sep 8 comment Prove that $-3/2\leq\cos a + \cos b + \cos c\leq 3$? Perhaps it's in 3 dimensions? The book doesn't make that very clear. Sep 8 comment Prove that $-3/2\leq\cos a + \cos b + \cos c\leq 3$? @AdityaDev Angle between the vectors $u,v$. Sep 8 comment Prove that $-3/2\leq\cos a + \cos b + \cos c\leq 3$? @mastrok In the plane. Sep 8 accepted Prove that the biscetors of adjacent suplementary angles are perpendicular? Sep 8 asked Prove that $-3/2\leq\cos a + \cos b + \cos c\leq 3$? Sep 8 comment Prove that the biscetors of adjacent suplementary angles are perpendicular? I still don't understand it, why did you omit the sum and subtraction of $A'$ for each vector? See: $$C=\cfrac{1}{2}(B'-A')+A'\quad \quad \quad D=\cfrac{1}{2}(B'+A')-A'$$ Sep 8 comment Prove that the biscetors of adjacent suplementary angles are perpendicular? @GAVD Why didn't you add and subtracted $A'$? Sep 8 asked Prove that the biscetors of adjacent suplementary angles are perpendicular? Sep 4 asked Could two different sums yield two different areas? Sep 3 accepted What's the necessary condition for that any three vectors are parallel to the edges of a triangle in the plane?