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cot(pi)/(18)*cot(pi)/(9)*cot(pi)/(4)*cot...

cot(pi)/(18)*cot(pi)/(9)*cot(pi)/(4)*cot(4 pi)/(18)*cot(7 pi)/(18)=

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cot(-15pi)/(4)

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))=

S.T cot.(pi)/(16).cot.(2pi)/(16).cot.(3pi)/(16).....cot.(7pi)/(16)=1

Prove that "cot"(pi)/(8)"cot"(3pi)/(8)"cot"(5pi)/(8)"cot"(7pi)/(8)=1.

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

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

cot((pi)/(4)-2cot^(-1)3)