you really insist huh?
1a.. i believe you know ..
so the first thing you do is to set
1b.. you may want to divide first and you will get a constant + 1 over something.. that 1 over something is an form when integrated..
EDIT: I didn't see that there was a power of 7. anyways, use a substitution on the denominator with out the power..
1d.. you may want to separate first.. for the first addends, set .. for the second addends, it just a direct application of what you should have learned..