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Rewrite the Expression in Terms of Exponentials and Simplify the Results

Question 141

Multiple Choice

Rewrite the expression in terms of exponentials and simplify the results.
- $\cosh 3 x + \sinh 3 x$

A) $3 x$
B) $e ^ { 3 x }$
C) $\mathrm { e } ^ { 3 x } - \mathrm { e } ^ { - 3 \mathrm { x } }$
D) $2 \mathrm { e } ^ { 3 \mathrm { x } }$

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