# 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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