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cotxcot2x-cot2xcot3x-cot3xcotx=1...

`cotxcot2x-cot2xcot3x-cot3xcotx=1`

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To prove the equation \( \cot x \cot 2x - \cot 2x \cot 3x - \cot 3x \cot x = 1 \), we can follow these steps: ### Step 1: Rewrite \( \cot 3x \) We can express \( \cot 3x \) using the angle addition formula: \[ \cot 3x = \cot(x + 2x) \] Using the formula for \( \cot(A + B) \): ...
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