\( \alpha, \beta, \gamma \) and \( \delta \) are angles in I, II, I...

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\( \alpha, \beta, \gamma \) and \( \delta \) are angles in I, II, III and IV quadrants, respectively and none of them is an integral multiple of \( \pi / 2 \). They form an increasing arithmetic progression.
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4. Which of the following holds?
(1) \( \cos (\alpha+\delta)0 \)
(2) \( \cos (\alpha+\delta)=0 \)
(3) \( \cos (\alpha+\delta)0 \)
(4) \( \cos (\alpha+\delta)0 \) or \( \cos (\alpha+\delta)0 \)
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