For each of the following integrals, indicate whether integration by substitution or integration by parts is more appropriate, or if neither method is appropriate. do not evaluate the integrals.

a. ∫ xsinx dx
i. substitution
ii. neither
iii. integration

b. ∫ x⁴/(1+x³). dx
i. substitution
ii. neither
iii. integration

c. ∫ x⁴. e^x³. dx
i. substitution
ii. neither
iii. integration

d. ∫x⁴ cos(x⁵). dx
i. substitution
ii. neither
iii. integration

e. ∫1/√9x+1 .dx
i. substitution
ii. neither
iii. integration