defence exam Army Havildar SAC Mock Test Series 2025 Mathematics Trigonometry Multiple and Sub-multiple Angles
\(\rm \frac{cosA+cosB}{sinA-sinB}=\)
1
\(\rm tan\frac{A+B}{2}\)
2
\(\rm tan\frac{A-B}{2}\)
3
\(\rm cot\frac{A+B}{2}\)
4
\(\rm cot\frac{A-B}{2}\)