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Stu, don't let that stop you from signing up. I too was very nervous about the maths before starting, and found it hard going in places but it was not insurmountable and you really get a different understanding of the topics from working through the exercises rather than just watching the lectures. That said, watching the lectures alone will give you a good grounding in astrophysics, relativity and cosmology.
I got a couple of algebra books from the library and did what I could from them in the weeks running up to the course which helped a lot. As the course states, nothing more than high school level algebra is required.
But in the end, there is no obligation if you sign up and the video lectures alone are worth their weight in gold.
Malc
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