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Prove the Identity cot⁡3x=cot⁡x(csc⁡2x−1)\cot ^ { 3 } x = \cot x \left( \csc ^ { 2 } x - 1 \right)

Question 12

Essay

Prove the identity.
- cot⁡3x=cot⁡x(csc⁡2x−1)\cot ^ { 3 } x = \cot x \left( \csc ^ { 2 } x - 1 \right)

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