JEE MATHEMATICS MCQ: PROPERTIES OF TRIANGLES

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Application +4 | -1

In a triangle

A B C, 2 a^2+4 b^2+c^2=4 a b+2 a c

, then the numerical value of

\cos B

is equal to

View answer and explanation

Correct option: D

\frac{7}{8}

Option D (7/8) is correct because it is the result of using the cosine rule and the given equation to find the value of cos B.

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