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Consider the following two statements about the function $f(x)=\left\vert x\right\vert$:

• P. $f(x)$ is continuous for all real values of $x$.
• Q. $f(x)$ is differentiable for all real values of $x$ .

Which of the following is TRUE?

1. P is true and Q is false.
2. P is false and Q is true.
3. Both P and Q are true.
4. Both P and Q are false.
asked in Calculus | 330 views

ans is A. f(x)=|x| here for all values of x, f(x) exists. therefore it is continuous for all real values of x.

At x=0, f(x) is not differentiable. Because if we take the left hand limit here, it is negative while the right hand limit is positive.

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at x= 0, Left hand derivative is not equal to right hand derivative. So it is not differentiable.