" If `alpha=(2 pi)/(7)` ,then the value of `tan alpha tan2 alpha+tan2 alpha tan4 alpha+tan4 alpha tan alpha` is "

If alpha=(pi)/(14), then the value of (tan alpha tan2 alpha+tan2 alpha tan4 alpha+tan4 alpha tan alpha) is 1(b)1/2(c)2(d)1/3

If alpha=(2 pi)/(7) then tan alpha tan^(7)2 alpha+tan2 alpha tan4 alpha+tan2 alpha tan4 alpha=

If alpha=(2 pi)/(7), then tan alpha tan2 alpha+tan2 alpha tan4 alpha+tan4 alpha tan alpha

" If "alpha=(2 pi)/(7)" ,and "tan alpha tan2 alpha+tan2 alpha tan4 alpha+tan4 alpha tan alpha=K" .Then "3k^(2)+4k+5=" ."

tan alpha+2tan2 alpha+4tan4 alpha+8cot8 alpha=cot alpha

If alpha = (2pi)/7 prove that tan alpha *tan 2alpha + tan 2alpha* tan 4alpha + tan 4alpha* tan a = - 7