Simplify
- $e ^ { x }$ $\mathrm { e } ^ { - \mathrm { x } }$

question 44

Short Answer

Simplify.
-( $e ^ { x }$ + $\mathrm { e } ^ { - \mathrm { x } }$ $)^2$ Enter your answer exactly as $e ^ { a }$ + $\mathrm { e } ^ { \mathrm { b } }$ + c (b < a).

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