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Verify That Each Equation Is an Identity $\sec ^ { 4 } x - \tan ^ { 4 } x = \sec ^ { 2 } x + \tan ^ { 2 } x$

Question 133

Essay

Verify that each equation is an identity.
- $\sec ^ { 4 } x - \tan ^ { 4 } x = \sec ^ { 2 } x + \tan ^ { 2 } x$

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