a$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}{x}^{2}cos(x^3+3)dx=$

b$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{x}{\sqrt[\phantom{2}]{1-3x^2}}dx=$

c$){\displaystyle \underset{0}{\overset{5}{}}}(x-1{)}^{21}dx=$

d$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}2x(x^2+3{)}^{5}dx=$

e$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}x{e}^{x^2}dx=$

f$){\displaystyle \underset{0}{\overset{1}{}}}\frac{e^x+3}{e^x}dx=$

g$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{x}{x^2+2}dx=$

h$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}cos(t)si{n}^3(t)dt=$

i$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}(4x-1{)}^{20}dx=$