The expansion of $(e^{x} + e^{- x})^{2} - (e^{x} - e^{- x})^{2}$ is equal to

1

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2

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4

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3

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Solution

The correct option is C $4$
$= (e^{2 x} + e^{- 2 x} + 2) - (e^{2 x} + e^{- 2 x} - 2)$
$= 4$

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