In a triangle ABC, if a, b and c are the lengths of the sides opposite to the angles A, B and C respectively, then what is (A-B) (A+B) equal to?

NDA 2026 Mathematics question

In a triangle , if , and are the lengths of the sides opposite to the angles , and respectively, then what is equal to?

Answer: (C)

Multiply numerator and denominator by : ,

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Question ID VK-030288