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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?