Which of the following is / are correct, when \( n \in I \) \( \mat...

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Which of the following is / are correct, when \( n \in I \)
\( \mathrm{P} \)
(1.) \( \sin (2 n+1) \pi / 2=1 \)
W
(2) \( \cos (2 n+1) \pi=1 \)
(3) \( \sin (4 n+1) \pi / 2=1 \)
(4) \( \cos (2 n \pi)=1 \)
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