結果 : tan 20 degrees value in fraction
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tan20/cot70 find the exact value

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The value of `tan20^@+tan40^@+sqrt3tan20^@tan40^@` is

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The value of ` (cot 54^(@))/(tan 36^(@)) + (tan 20^(@))/(cot 70^(@))` is

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`tan 20^@+tan 40^@+tan 60^@+...........+tan 160^@+tan 180^@=`

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

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`tan20^@+tan25^@+tan20^@.tan25^@=....`

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