I feel it quite difficult to prove this equation:(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\frac{1}{2}[/itex]tan([itex]\frac{1}{2}[/itex]x)+[itex]\frac{1}{2^2}[/itex]tan([itex]\frac{1}{2^2}[/itex]x)+...+[itex]\frac{1}{2^n}[/itex]tan([itex]\frac{1}{2^n}[/itex]x)=[itex]\frac{1}{2^n}[/itex]cot([itex]\frac{1}{2^n}[/itex]x)-cotx

Can you help me with it?

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# Prove this equation with calculus knowledge

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