define sine rule and cosine rule
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In trigonometry, the law of sines, sine law, sine formula, or sine rule is an equation relating the lengths of the sides of a triangle to the sines of its angles.
In trigonometry, the law of cosines relates the lengths of the sides of a triangle to the cosine of one of its angles.
In trigonometry, the law of cosines relates the lengths of the sides of a triangle to the cosine of one of its angles.
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