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To find an unknown angle:

cosA= b2+c2-a2

              2bc

To find an unknown length:

a2=b2+c2-2bc cosA

Natalie H. A Level Business Studies tutor, GCSE Business Studies tuto...

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Deimena K.

Degree: Management (Bachelors) - LSE University

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Degree: Modern Languages (Bachelors) - Exeter University

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