Question:
Prove that
$f(x)=\left\{\begin{aligned} \cos x, & \text { when } x \geq 0 ; \\-\cos x, & \text { when } x<0 \end{aligned}\right.$ is discontinuous at $x=0$
Solution:
Click here to get exam-ready with eSaral
For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.