Question: Using (2), show that for every x , e-x = 1/ex ex > 0 ex as x

Using (2), show that for every x ∊ ℜ,
• e-x = 1/ex
• ex > 0
• ex → ∞ as x → ∞ and ex → 0 as x → - ∞
This implies that the exponential function maps ℜ onto ℜ+.

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