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How does the cosine rule relate to area ?

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How does the cosine rule relate to area ?

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Is the cosine law more useful than the sine law? Also, how was the sine law discovered? 

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Is the cosine law more useful than the sine law? Also, how was the sine law discovered? 

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Does Trigonometry only work on right angle triangles? Do all non-right angle triangles need to be split to make right angle triangles for trigonometry to apply?

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Does Trigonometry only work on right angle triangles? Do all non-right angle triangles need to be split to make right angle triangles for trigonometry to apply?

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Are there any trigonometric rules we can apply for other polygons?

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What do we use the sine law for?

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Is there such thing as a cosine law? Does it work with all angles (obtuse)?

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Is there such thing as a cosine law? Does it work with all angles (obtuse)?

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When does Sine Rule become invalid?

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Are there any alternatives to the sine law?

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Is it just an extension of normal trig rules?

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Why is the sine law important in mathematics?

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How can we use the sine law in real life examples?

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How can we use the sine law in real life examples?

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Is the Sine Law commonly used?

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Will the sine law work with a triangle with an obtuse angle?

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is there a tangent law?