integration by parts:
1. e^(sqrt(3x+9))
2. sin(lr)
are the answers:
1. 2e^(sqrt(3x+9))(sqrt(3x+9)-1) + C
2. -r cos(lnr) + sin(lr) + C
1. e^(sqrt(3x+9))
2. sin(lr)
are the answers:
1. 2e^(sqrt(3x+9))(sqrt(3x+9)-1) + C
2. -r cos(lnr) + sin(lr) + C