sin(X - Y) = sin X cos Y - cos X sin Y అయితే, \(\frac{\sin (A-B)}{\cos A \cos B}+\frac{\sin (B-C)}{\cos B \cos C}\) విలువ:
1
\(\frac{\cos (A+C)}{\sin A \sin C}\)
2
\(\frac{\sin (C-A)}{\cos A \cos C}\)
3
\(\frac{\cos (A+C)}{\cos A \cos C}\)
4
\(\frac{\sin (A-C)}{\cos A \cos C}\)