`cot(pi/20) cot((3pi)/20) cot((5pi)/20) cot((7pi)/20) cot((9pi)/20) cot((15pi)/20)=`

cot((pi)/(20))cot((3 pi)/(20))cot((5 pi)/(20))cot((7 pi)/(20))cot((9 pi)/(20))cot((15 pi)/(20))=

cot(-15pi)/(4)

tan((pi)/(20))tan(3(pi)/(20))tan(5(pi)/(20))tan(7(pi)/(20))tan(9(pi)/ (20))

Find the value of cot""(pi)/20.cot""(3pi)/20.cot""(5pi)/20.cot""(7pi)/20.cot""(9pi)/20

tan(pi/8)+cot(pi/8)=

cot((pi)/(4)-x)+cot((pi)/(4)+x)=4

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))

cot^(-1)(cot((5pi)/6)) =

cot((pi)/(8))-tan((pi)/(8))=2

cos((3pi)/(2) +x) cos(2pi+x)[cot(3pi)/(2)-x+cot(2pi+x)]=1