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
\(\rm cot\frac{A-B}{2}\)

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