Calculating indefinite integrals

[Cacophony]

Homework Statement

a) S 13(4^x + 3^x)dx
b) S (cosx + sec^2x)dx
c) S (3-(1/x))dx
d) S e^(7x)dx

Homework Equations

The S is supposed to be the integration sign

The Attempt at a Solution

Are these correct or at least close?

a) = 13((4^x)/(ln(4) + (3^x)/(ln(3))) + C

b) = (sinx + tanx) + C

c) = -ln + C

d) Do I use U-substitution for this one?

 

[HallsofIvy]

c) and d) are incorrect. The integral of "3" is "3x". For d), yes, use substitution. Let u= 7x.