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Module 1: Trigonometry 1

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XSIQ
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Core Mathematics - The cosine rule

The cosine rule

The sine rule will not always be sufficient to solve non-right angled
triangles. For the diagram shown opposite the must be used. In any
triangle _ABC_ where _a_ is the side opposite angle _A_, _b_ is opposite
_B_, and _c_ is opposite _C_:

Use the cosine rule when given:

* two sides and the included angle

* three sides

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