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Some problems are as follows :

Simplify the given expression :

A) If sin x = 1/3 and 0 < x < pi/2, then sin(pi/4 + x) = ?

The answer to this problem is 4+ sqrt 2 all over 6. And I have no idea how to get there. This section in the chapter mostly discusses sin(A+B) = SinASinB-CosACosB

B) If Sin x = -3/4 and 3pi/2 < x < 2pi then cos (pi/4 + x) = ?

Thanks in advance for your help.

If you don't know how to solve it, but at least know what I could look up to figure out how to get to this solution it would be much appreciated. Final is tomorrow and I'm trying to teach myself most of the concepts as my professor was pretty subpar this semester, and I'm not the best student!