1. f(x)=2x^5+3x^2-5 2. f(x)=cosx+e^x 3. f(x)=4^x-5sinx 4. f(x)=x^2/3-sinx 5. f(x)=3/cos^2x+7/x 6. f(x)=x^2+7+12 7. f(x)=8cosx-7e^x 8. f(x)=4/x-2/sin^2x 9. f(x)=sinx-5x+3^x 10. f(x)=x^3/2-cosx 11. f(x)=3+2x^2 12. f(x)=2e^x-3cosx 13. f(x)=7^x-6/x 14. f(x)=2/x^3-9/sin^2x 15. f(x)=sin x-e^x 16. f(x)=8x^4+3x^2-4x+6 17. f(x)=4cosx+9e^x 18. f(x)=-3/x+10/sin^2x 19. f(x)=15^x-sinx 20. f(x)=cosx-e^x