prove (cos 4x cos 3x cos 2x)/ (sin 4x sin 3x sin 2x) = cot 3x
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`( cos 4x cos 3x cos 2x )/( sin 4x sin 3x sin 2x) = cot3x`
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'(cos4x cos3x cos2x)/(sin4x sin3x sin2x)=cot3x ' ||
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