In a \( \triangle A B C \), which of the following is/are true? (1)...

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In a \( \triangle A B C \), which of the following is/are true?
(1) \( \sin A \sin B \sin C \leq \frac{3 \sqrt{3}}{8} \)
\( \mathrm{P} \)
(2) \( \sin ^{2} A+\sin ^{2} B+\sin ^{2} C \leq \frac{9}{4} \)
(3) \( \sin A \sin B \sin C \) is always positive
(4) \( \sin ^{2} A+\sin ^{2} B \leq 1+\cos C \)
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