Prove that x- 2x-2x-3x-x- 3x-1

Cot x cot 2x cot 2x cot 3x cot 3x cot 4x #160;= cot x cot 2x cot 3x (cot 2x+ cot x)= cot x cot 2x cot (2x+x)(cot 2x+ cot x)[ as cot (A+B)=cot A c ...

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Conditional Identities

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Question

Prove that $cot x . cot 2 x - cot 2 x . cot 3 x - cot x . cot 3 x = 1$

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