Which of the following statements is false?

  • A
    $\log(1 + x) < x$ for $x > 0$
  • B
    $\frac{x}{1 + x} < \log(1 + x)$ for $x > 0$
  • C
    $e^x > 1 + x$ for $x > 0$
  • D
    $e^x < 1 - x$ for $x > 0$

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The function $f(x) = \begin{cases} |x - 3| & x \geqslant 1 \\ \frac{x^2}{4} - \frac{3x}{2} + \frac{13}{4} & x < 1 \end{cases}$ is :

Consider the function $f(x) = x \cos x - \sin x$. Identify the correct statement.

Let $f(x)$ be a non-negative differentiable function on $[0, \infty)$ such that $f(0)=0$ and $f^{\prime}(x) \leq 2 f(x)$ for all $x>0$. Then,on $[0, \infty)$:

$(i)$ $f(x)$ is continuous and defined for all real numbers.
$(ii)$ $f'(-5) = 0$; $f'(2)$ is not defined and $f'(4) = 0$.
$(iii)$ $(-5, 12)$ is a point which lies on the graph of $f(x)$.
$(iv)$ $f''(2)$ is undefined,but $f''(x)$ is negative everywhere else.
$(v)$ The signs of $f'(x)$ are given below:
| $x$ | $(-\infty, -5)$ | $-5$ | $(-5, 2)$ | $2$ | $(2, 4)$ | $4$ | $(4, \infty)$ |
|---|---|---|---|---|---|---|---|
| $f'(x)$ | $+$ | $0$ | $-$ | Undefined | $+$ | $0$ | $-$ |
Possible graph of $y = f(x)$ is:

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