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Prove that cotx cot2x - cot2x cot3x - co...

Prove that `cotx cot2x - cot2x cot3x - cot3x cotx = 1`

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The correct Answer is:
`A to q; B to r; C to p,r; D to q,r,s;`
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ARIHANT MATHS-INVERSE TRIGONOMETRIC FUNCTIONS-Exercise (Single Integer Answer Type Questions)
  1. Prove that cotx cot2x - cot2x cot3x - cot3x cotx = 1

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