Cos and sin

Geometry Level pending

Which of the following statements is/are true?

(1). \(\cos(\theta) = \cos(-\theta) \) for all angles \(\theta\).
(2). \(\sin(\theta) = \sin(-\theta) \) for all angles \(\theta\).
(3). \(\cos(\theta) = \cos(-\theta) \) for some angles \(\theta\).
(4). \(\sin(\theta) = \sin(-\theta) \) for some angles \(\theta\).

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