1-20 Find the most general antiderivative of the function. (Check your answer by differentiation.) 1. f(x) = {{ + ³x² − ³x³ 3. f(x) = (x + 1)(2x − 1) 5. f(x) = 5x¹/4 - 7x³/4 7. f(x) = 6 √x - √x 9. f(x) = √2 11. c(t) = 2,1 1>0 13. g(0) = cos 0 - 5 sin 0 15. v(s) = 4s + 3e¹ 2. f(x) = 8x - 3x + 12x³ 4. f(x) = x(2 - x)² 6. f(x) = 2x + 3x¹.7 8. f(x)=√x + √√xª 10. f(x) = e² 12. h(m) 2 √m 14. f(x) = 2√x + 6 cos x 16. u(r) - e -2