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They are both equally accurate.

However,

sin(x) = sin(180-x) where x is in degrees. This means that the sin law cannot distinguish between, say an angle of 30 degrees and 150 degrees.

On the other hand,

cos(x) = -cos(180-x) and so has a unique solution for 0<x<180 which is valid range for angles of a triangle.

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Q: Why is the law of cosines more accurate than the law of sines?
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