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Two sides a, b and the angle between them are known. Which rule gives the difference of the other two angles?
ALaw of tangents
BHeron's formula
CEuclid's area rule
DSine area rule
Answer & Solution
Correct answer: A. Law of tangents
The tangent rule links (a - b)/(a + b) to tangents of half the angle difference and half the angle sum, which yields the difference.
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