Integral of 1/(a + b cos x) by putting t = tan(x/2)

1. A.
   $-2\sqrt{2}$
2. B.
   $2$
3. C.
   $-2 - 2\sqrt{2}$
4. D.
   $-2$

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1. A.
   $\frac{2\pi}{7}$
2. B.
   $\frac{\pi}{\sqrt{7}}$
3. C.
   $\frac{\pi}{2\sqrt{7}}$
4. D.
   $\frac{\pi}{7}$

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1. A.
   $\pi$
2. B.
   $\dfrac{\pi}{2}$
3. C.
   $\dfrac{\pi}{3}$
4. D.
   $\dfrac{\pi}{4}$

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