Cosine rule for JEE

Formula

\(a^2=b^2+c^2-2bc\cos A\),\quad \(b^2=c^2+a^2-2ca\cos B\),\quad \(c^2=a^2+b^2-2ab\cos C\)

Variables: \(a,b,c\) are sides opposite angles \(A,B,C\).

Conditions: For any triangle.

Triangle solving and applications of trigonometry.