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OpenStudy (anonymous):
If in triangle ABC, a=5, b=6 and c=8, then cos A is...
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OpenStudy (anonymous):
a² = b² + c² - 2bc cosA
OpenStudy (anonymous):
This is the cosine rule for triangles. Now, simply plug in the values to find cosine of A.
OpenStudy (shayaan_mustafa):
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