OpenStax, Algebra and Trigonometry 2e §10.2 Non-right Triangles: Law of Cosines · Exercise 58 · Trigonometry · Laws of sines & cosines
Non-right Triangles: Law of Cosines · Exercise 58
Suppose that represents the relationship of three sides of a triangle and the cosine of an angle.
Find the length of the third side.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Algebra and Trigonometry 2e · §10.2 Non-right Triangles: Law of Cosines · Exercise 58
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