MCQ
Let $f(x) = e^x - e^{-x} + cosx$, then $f(x)$ is
- ✓always increasing
- Balways decreasing
- Cnon differentiable at $x = 0$
- Dlocal maxima at $x = 1.$
✓
Answer
Correct option: A.
always increasing
a
$f'(x) = (e^x - e^{-x}) - sinx$
alwasys positive and three an increasing function.
$f'(x) = (e^x - e^{-x}) - sinx$
alwasys positive and three an increasing function.
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