Fourier series equation for a even square wave

Jensen-
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Can someone please help me with a Fourier series equation for a even square wave shown below:

F(t) = 0 when -2ms <t < -1ms
k when -1ms <t < 1ms
0 when 1ms <t < 2ms T=4

Im after finding the first 10 harmonic components. To be honest struggling with this one integration is not my strong point.
 
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Show us some work and what integral you are stuck on.
 
Hello, sorry for the late reply. I believe I have succesfully found Ao in my equation but An I am struggling with. I have attached my workings out if you may take a look it would be much appreciated.
 

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