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cot(pi/20) cot((3pi)/20) cot((5pi)/20) c...

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

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cot((-15pi)/4)

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

Show that cot.(pi)/(20). cot .(3pi)/(20). cot.(5pi)/(20). cot .(7pi)/(20). cot.(9pi)/(20)=1

cot(-15pi)/(4)

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

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

cot (- (15pi)/(4))

cot (- (15pi)/(4))

cot (- (15pi)/(4))

cot (- (15pi)/(4))