Three trig terms in G.P.: general solution

1. A.
   $2n\pi \pm \frac{\pi}{3},n \in \mathbb{Z}$
2. B.
   $n\pi + \frac{\pi}{3},n \in \mathbb{Z}$
3. C.
   $n\pi + \frac{\pi}{4},n \in \mathbb{Z}$
4. D.
   $\ 2n\pi \pm \frac{\pi}{6},n \in \mathbb{Z}$

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1. A.
   $n\pi + (-1)^n\left(\dfrac{\pi}{3}\right), n \in \mathbb{Z}$
2. B.
   $2n\pi + (-1)^n\left(\dfrac{\pi}{2}\right), n \in \mathbb{Z}$
3. C.
   $n\pi + (-1)^{n+1}\left(\dfrac{\pi}{2}\right), n \in \mathbb{Z}$
4. D.
   $2n\pi + (-1)^n + \left(\dfrac{\pi}{4}\right), n \in \mathbb{Z}$

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