Verify That the Equation Is an Identity $$\sec ^ { 2 } \frac { u } { 2 } = \frac { 2 \sec u } { \sec u + 1 }$$

question 190

Essay

Verify that the equation is an identity.
- $$\sec ^ { 2 } \frac { u } { 2 } = \frac { 2 \sec u } { \sec u + 1 }$$

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a value that is not directly stated but can be derived from given information through analysis or calculation.

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