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[" 12.Lustration "3.48" ,and fransformat...

[" 12.Lustration "3.48" ,and fransformation formulas "],[" prove that "tan(pi)/(16)+2tan(pi)/(8)+4=cot(pi)/(16)" ."]

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Prove that tan(pi/16)+2tan(pi/8)+4=cot(pi/6) .

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

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

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

Prove that: tan(pi/6).tan(pi/3)=tan(pi/4)

Prove that: tan(pi/4+A). Tan((3pi)/4)+A=-1

Prove that: tan(pi/4+A). Tan((3pi)/4)+A=-1

Prove that: tan(pi/4+A)+tan(pi/4-A) = 2sec2A

Prove that: tan(pi/4+A)+tan(pi/4-A) = 2sec2A

The value of "tan"(pi)/(5) +2"tan"(2pi)/(5)+4"cot"(4pi)/(5) is