Which of the following is 0 at \( x=n \pi, n \in I \) ?
\( \mathrm{... VIDEO
Which of the following is 0 at \( x=n \pi, n \in I \) ?
\( \mathrm{P} \)
(1) \( \tan x \)
(2) \( \sin x \)
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(3) \( \cot x \)
(4) \( \cos x \)
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