Solve the Problem $$\sec ^ { 2 } \frac { \mathrm { u } } { 2 } = \frac { 2 \sec \mathrm { u } } { \sec \mathrm { u } + 1 }$$

question 348

Essay

Solve the problem.

- $$\sec ^ { 2 } \frac { \mathrm { u } } { 2 } = \frac { 2 \sec \mathrm { u } } { \sec \mathrm { u } + 1 }$$

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