Integrand over sin^2 x cos^2 x: split using sin^2 x + cos^2 x = 1

1. A.
   $\tan x + \cot x + c$, where c is the constant of integration.
2. B.
   $\ \tan x - \cot x + c$, where c is the constant of integration.
3. C.
   $\tan x\ \cot x + c$, where c is the constant of integration.
4. D.
   $\tan x - \cot 2x + c$, where c is the constant of integration.

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1. A.
   $\cot x + \cot^2 x + c$, where c is the constant of integration
2. B.
   $\tan x - \cot x - 3x + c$, where c is the constant of integration
3. C.
   $2\sin^5 x + 2\cos^5 x + c$, where c is the constant of integration
4. D.
   $\sin^3 x + 2\cos^3 x + c$, where c is the constant of integration

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1. A.
   $\dfrac{1}{2}\tan x + c$
2. B.
   $\cot 2x + \tan 2x + c$
3. C.
   $\sec 2x + c$
4. D.
   $\dfrac{1}{2}(\tan 2x - \cot 2x) + c$

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