E
Editor
Sep 18, 2022
If $\alpha, \beta\:and\:\gamma$ are the measures of the angles of a triangle, and a, b and c are the lengths of sides opposite these angles then according be law of cosine, the value of $cosine\gamma$ is defined as:
Difficulty: Easy
A:
$\cos\gamma=\frac{a^{2}+c^{2}-b^{2}}{2ac}$
B:
$\cos\gamma=\frac{a^{2}+c^{2}-b^{2}}{2ac}$
C:
$\cos\gamma=\frac{a^{2}+c^{2}+2ab\cos\gamma}{b^{2}}$
D:
$\cos\gamma=\frac{b^{2}+c^{2}-a^{2}}{2bc}$
ID: 63273db9ca83163ac3a119a3