The absolute value of the expression `tan(pi/(16))+tan((5pi)/(16))+tan((9pi)/(16))+tan((13pi)/(16))` is ______

tan((pi)/(10))+tan((3 pi)/(10))+tan((7 pi)/(10))+tan((9 pi)/(10))=

Prove that tan((pi)/(12))+tan((pi)/(6))+tan((pi)/(12))tan((pi)/(6))=1

Find the exact value of the expression tan((pi)/(20))-tan((3 pi)/(20))+tan((5 pi)/(20))-tan((7 pi)/(20))+tan((9 pi)/(20))

Prove that tan((pi)/(16))+2tan((pi)/(8))+4=cot((pi)/(16))

Find the exact value of tan^(2)((pi)/(16))+tan^(2)((3 pi)/(16))+tan^(2)((5 pi)/(16))+tan^(2)((7 pi)/(16))

tan x tan(x+(pi)/(3))+tan x tan((pi)/(3)-x)+tan(x+(pi)/(3))tan(x-(pi)/(3 ))=

The value of the expression sin^(-1)(sin((22 pi)/7))-tan^(-1)(tan((5 pi)/7)) is

The value of the expression tan. (pi)/(7)+ 2 tan. (2pi)/(7)+ 4 tan . (4pi)/(7)+ 8 cot. (8pi)/(7) is equal to

tan^(2)((pi)/(16))+tan^(2)((2 pi)/(16))+tan^(2)((3 pi)/(16))... ..+tan^(2)((7 pi)/(16)/)=35