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What is the value of ?

  1. e2
  4. None of these.

Answer (Detailed Solution Below)

Option 4 : None of these.
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Detailed Solution

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Concept:

Exponential Series:

  • ex = .


Calculation:

We know that ex = .

Also, e-x = .

∴ ex + e-x = .

Putting x = 1, we get:

.

⇒ .

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