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 Apr9 answered Summation of $\frac {n^a}{n!}$ Apr9 revised What is $\tan \alpha$ if $\sin \alpha + \cos \alpha = \frac{\sqrt{3}-1}{2}$ and $\alpha \in (90^\circ,135^\circ)$ added 306 characters in body Apr9 answered What is $\tan \alpha$ if $\sin \alpha + \cos \alpha = \frac{\sqrt{3}-1}{2}$ and $\alpha \in (90^\circ,135^\circ)$ Apr9 comment Find point of passing of two racers. @N.F.Taussig, Agreed and that is again the starting point Apr9 comment Find point of passing of two racers. Now at $k=1,$ the time $=\dfrac{2t}5$ whereby the winner will traverse $\dfrac25\cdot3000$ meter $\equiv0\pmod{300}$ which is the starting point and check for $k=2$ Apr9 answered Find point of passing of two racers. Apr9 comment How can I calculate $d$ from this equation? @lary, As $\pmod{55}\iff\pmod5$ and $\pmod{11}$ Apr9 answered How can I calculate $d$ from this equation? Apr9 comment How can we use an identity to solve the equation $1-\tan^2 \theta = \frac{2}{3}$? @tapadianewlon, See math.stackexchange.com/questions/1217025/… Apr8 answered How do I prove that $\arccos(x) + \arccos(-x)=\pi$ when $x \in [-1,1]$? Apr8 answered Summation To Infinity Question Apr8 answered Finding roots of complex polynomial with conjugates Apr8 comment $\sin(2\pi/7) + \sin(4\pi/7) + \sin(8\pi/7) = (root7)/2$ For the product see, math.stackexchange.com/questions/8385/… Apr8 comment Prove that the greatest common factor of $m+n$ and $m^2+n^2$ is 1 or 2 if $m$ and $n$ are relatively prime. @encuka, $(m,n)=1\implies p|2\implies p=1,2$ Apr8 answered Prove that the greatest common factor of $m+n$ and $m^2+n^2$ is 1 or 2 if $m$ and $n$ are relatively prime. Apr8 revised Find the last three digits of $17^{256}$ added 249 characters in body Apr8 answered Find the last three digits of $17^{256}$ Apr8 answered triangle trigonometry Apr8 revised Sum of coefficients in an multinomial expression. added 30 characters in body Apr8 answered Sum of coefficients in an multinomial expression.