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May
14
accepted How to show that $at^2+bt+c$ can be written as $\displaystyle \begin{equation} a \left( t+\frac{b}{2a}\right) ^2-\frac{1}{4a}(b^2-4ac)\end{equation}$?
May
14
accepted What is $R(k,l)$?
May
14
comment What is $R(k,l)$?
Oh, now I get it. Thanks.
May
14
asked What is $R(k,l)$?
May
6
awarded  Notable Question
May
6
revised Why the $GCD$ of any two consecutive fibonnaci numbers is $1$?
added 433 characters in body; edited tags
May
6
asked Why the $GCD$ of any two consecutive fibonnaci numbers is $1$?
May
6
comment Why can't we eliminate $t$?
@MatemáticosChibchas Yes, my child. I am very fond of this song, you should be too.
May
6
accepted Is there a problem in assuming that a point is the same thing of a vector?
May
6
asked Why can't we eliminate $t$?
May
4
awarded  Popular Question
Apr
30
asked Is there a problem in assuming that a point is the same thing of a vector?
Apr
28
asked Why $\frac{x}{\sqrt{x+1}-1}$ can be written as $\sqrt{x+1}+1$?
Apr
27
comment At which points the tangent lines of the function $y=\cos x$ are parallel to $-\frac{1}{2}x+1$?
@user37238 Yes! I guess you helped me to find the silly mistake. Let me write it.
Apr
27
comment At which points the tangent lines of the function $y=\cos x$ are parallel to $-\frac{1}{2}x+1$?
@user37238 When I evaluate $-\sin x=- 1/2$, I'd have the pair $(\pi/6,-1/2)$. The first item of the pair is $x$, the second one is $y$. I just made the substitution.
Apr
27
asked At which points the tangent lines of the function $y=\cos x$ are parallel to $-\frac{1}{2}x+1$?
Apr
20
reviewed Approve How do I find $\frac{d}{dz}\left(\frac{2z-i}{z+2i}\right)\text{?}$
Apr
20
comment How to show that $0<b'<b$?
@rightskewed Yes! The condition of comparability of rational numbers. I had this insight yesterday but used in a cumbersome way that yielded nothing. Now I forgot to use it. Thanks!
Apr
20
accepted Identify the subset of the plane composed by $R\cos \theta=5$ by means of polar coordinates $R,\theta$?
Apr
20
accepted Why $-1 \leq\frac{\langle A,B\rangle}{||A||\, ||B||}\leq1$?