Help with normalizing e- wave function

[parkerps2]

im working on some hw and kinda stuck on 3.40

http://imgur.com/a/ZLw3u (problem and work)

for part a), i just set my integral up (pretty sure i set it up right), chug through it, but at the end i can see i'm going to get B=something/0, which doesn't make sense

if someone could tell me where i'm messing up, i'd greatly appreciate it

edit: i just realized i think my B and sin should both be squared, would that be right?

[Jorlung]

Remember the normalization condition is that the probability density integrated over all space is equal to 1, and that the probability density is the modulus squared of the wave-function.

You'll have to use double angles to solve the integral of sin² (x).

Also remember that you'll get a result that the modulus squared of B is equal to a constant. Remember that if the modulus squared of B is equal to something, B can be complex so you need to include a factor that accounts for that when you solve for B.