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Science:Math Exam Resources/Courses/MATH102/December 2013/Question B 02/Hint 1

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< Science:Math Exam Resources | Courses/MATH102 | December 2013 | Question B 02

You may need the following formula (the cosine law):

$a^{2} = b^{2} + c^{2} - 2 b c \cdot \cos θ$

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