In a triangle ABC, if cos A + 2 cos B + cos C = 2 and the lengths… | JEE Main 2023 Mathematics PYQ

MCQMediumJEE Main 2023 · 12 April, Shift 1Properties of Triangles

In a triangle $ABC$ , if $\cos A + 2 \cos B + \cos C = 2$ and the lengths of the sides opposite to the angles $A$ and $C$ are $3$ and $7$ respectively, then $\cos A - \cos C$ is equal to:

A
$\frac{3}{7}$
B
$\frac{9}{7}$
C
$\frac{10}{7}$
D
$\frac{5}{7}$

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