JEE MATHEMATICS MCQ: PROPERTIES OF TRIANGLES

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Analyzing +4 | -1

\triangle A B C, a=5, b=4

and

\cos (A-B)=\frac{31}{32}

, then side

c

View answer and explanation

Correct option: A

Option A (6) is correct because by using the tangent half-angle formula and the cosine rule, the side c can be calculated to be 6.

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