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1. \( \tfrac{1}{4}x^4 - 7x^2 + 5x + C. \)
2. \( \tfrac{2.5}{6}x^6 - \tfrac{1}{2}x^2 - 1.25x + C. \)
3. \( 12.3y + C. \)
4. \( \pi^2 x + C. \)
5. \( e^P + C. \)
6. \( \tfrac{2}{3}x^{3/2} + e^x + \tfrac{1}{2x^2} + C. \)
7. \( \ln \lvert x \rvert + C. \)
8. \( -\tfrac{1}{x} + C. \)
9. \( \tfrac{1}{3}x^3 - 4x + C. \)
10. \( \tfrac{1}{5}t^5 - \tfrac{1}{2}t^2 + C. \)