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The least value of f(x) = (e^x+e^-x) is A. -2 B. 0 C. 2 D. none of these

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The least value of f(x) = (ex+e-x) is

A. -2

B. 0

C. 2

D. none of these

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Answer is : C. 2

f(x) = ex + e-x

f(x) is always increasing at x = 0 it has the least value

⇒ f(x) = 1+1/1 = 2

∴ The least value is 2.

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