1.7x10^-2 is the vertical component. so it's tension is: Tcos4=1.7x10^-3, rearrange to find in terms of T, which will be T=(1.7x10^-2)/(cos4). now to find the vertical component it's simply ANSsin4=1.1887...x10^-2 which is approximately 1.2x10^-3 newtons. I find doing this much simpler than using tan as I am able to visualize what I'm doing at every step much easier than I am with tan, hope this helps.