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Prove the Identity tan6utan4u=tan25utan2u1tan25utan2u\tan 6 u \tan 4 u = \frac { \tan ^ { 2 } 5 u - \tan ^ { 2 } u } { 1 - \tan ^ { 2 } 5 u \tan ^ { 2 } u }

Question 146

Essay

Prove the identity.
- tan6utan4u=tan25utan2u1tan25utan2u\tan 6 u \tan 4 u = \frac { \tan ^ { 2 } 5 u - \tan ^ { 2 } u } { 1 - \tan ^ { 2 } 5 u \tan ^ { 2 } u }

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