Which of the following is not the point of discontinuity of the function $f(x)=\frac{1+\cos 5 x}{1-\cos 4 x}$?
Answer & explanation
Correct answer: option 4
f(x) is continuous except at the points where 1 – cos 4x = 0.
Thus x = 0, x = $\frac{\pi}{2}$ and $x =\pi$ are point of discontinuity.
Hence (4) is the correct answers.