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Physics (vectors) question

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Red_x_Lily:
I decided the cosine rule is much more convenient. o.o 

Thanks for the info about the sig figures. Can't believe I didn't know about it...lol. It gets kinda annoying though when even the textbook isn't consistent, but I guess it's nothing to fuss about. I generally give my answers to two or three decimal places, or more depending on the question, but now I know what to look out for. And even that one mark can count sometimes...  ;)

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