Tan-10-tan3-10-tan7-10-tan9-10-

The correct option is A 0 tanπ10+tan3π10+tan7π10+tan9π10=tanπ10+tan3π10+tan(π 3π10)+tan(π π10) #160; #160; #160; #160; #160; #160; ...

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Algebra of Derivatives

tanπ10+tan3π1...

Question

$tan \frac{π}{10} + tan \frac{3 π}{10} + tan \frac{7 π}{10} + tan \frac{9 π}{10} = ?$

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tan \frac{10 π}{3}, tan \frac{9 π}{4}, tan \frac{7 π}{6}

I f t a n (\frac{π}{4} + \frac{y}{2}) = t a n^{3} (\frac{π}{4} + \frac{x}{2}), t h e n s i n x (\frac{3 + s i n^{2} x}{1 + 3 s i n^{2} x}) e q u a l s

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