Substitute to get t sin t, then integrate by parts (sin sqrt x and similar)

1. A.
   $\sin\sqrt{x}-2\sqrt{x}\cos\sqrt{x}+c$
2. B.
   $2\cos\sqrt{x}-2\sqrt{x}\sin\sqrt{x}+c$
3. C.
   $\cos\sqrt{x}-2\sqrt{x}\sin\sqrt{x}+c$
4. D.
   $2\sin\sqrt{x}-2\sqrt{x}\cos\sqrt{x}+c$

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1. A.
   $\left(x^{\frac{2}{3}}\cos x^{\frac{2}{3}} + \sin x^{\frac{2}{3}}\right) + c$
2. B.
   $3\left[x^{\frac{2}{3}}\cos x^{\frac{2}{3}} - \sin x^{\frac{2}{3}}\right] + c$
3. C.
   $3\left[-x^{\frac{2}{3}}\cos x^{\frac{2}{3}} - \sin x^{\frac{2}{3}}\right] + c$
4. D.
   $3\left[-x^{\frac{2}{3}}\cos x^{\frac{2}{3}} + \sin x^{\frac{2}{3}}\right] + c$

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