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 May14 accepted How to show that $at^2+bt+c$ can be written as $\displaystyle $$a \left( t+\frac{b}{2a}\right) ^2-\frac{1}{4a}(b^2-4ac)$$$? May14 accepted What is $R(k,l)$? May14 comment What is $R(k,l)$? Oh, now I get it. Thanks. May14 asked What is $R(k,l)$? May6 awarded Notable Question May6 revised Why the $GCD$ of any two consecutive fibonnaci numbers is $1$? added 433 characters in body; edited tags May6 asked Why the $GCD$ of any two consecutive fibonnaci numbers is $1$? May6 comment Why can't we eliminate $t$? @MatemáticosChibchas Yes, my child. I am very fond of this song, you should be too. May6 accepted Is there a problem in assuming that a point is the same thing of a vector? May6 asked Why can't we eliminate $t$? May4 awarded Popular Question Apr30 asked Is there a problem in assuming that a point is the same thing of a vector? Apr28 asked Why $\frac{x}{\sqrt{x+1}-1}$ can be written as $\sqrt{x+1}+1$? Apr27 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. Apr27 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. Apr27 asked At which points the tangent lines of the function $y=\cos x$ are parallel to $-\frac{1}{2}x+1$? Apr20 reviewed Approve How do I find $\frac{d}{dz}\left(\frac{2z-i}{z+2i}\right)\text{?}$ Apr20 comment How to show that \$0