Polar form of a complex number or point

1. A.
   $\left(4, \frac{3\pi}{4}\right)$
2. B.
   $\left(4, \frac{5\pi}{6}\right)$
3. C.
   $\left(4, \frac{2\pi}{3}\right)$
4. D.
   $\left(4, \frac{11\pi}{12}\right)$

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1. A.
   $\dfrac{1}{\sqrt{2}}\left(\cos\dfrac{7\pi}{4} + i\sin\dfrac{7\pi}{4}\right)$
2. B.
   $\dfrac{1}{\sqrt{2}}\left(\cos\dfrac{\pi}{4} + i\sin\dfrac{\pi}{4}\right)$
3. C.
   $\dfrac{1}{2}\left(\cos\dfrac{\pi}{4} + i\sin\dfrac{\pi}{4}\right)$
4. D.
   $\dfrac{1}{2}\left(\cos\dfrac{7\pi}{4} + i\sin\dfrac{7\pi}{4}\right)$

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