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

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

Text Solution

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`tan.(pi)/20tan.(3pi)/20tan.(5pi)/20tan.(7pi)/20tan.(9pi)/20`
`tan.(pi)/20tan.(3pi)/2tan.pi/4tan(pi/2-(3pi)/20)tan(pi/2-pi/20)`
`tan.(pi)/20tan.(3pi)/2(1) cot ((3pi)/20)cot(pi/20)`
=1
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