Mathematics Trigonometry Multiple and Sub-multiple Angles

త్రిభుజంలో \(\cos \left(\frac{A+B}{2}\right)=\ldots\)

1
\(\cos \frac{c}{2}\)
2
\(-\sin \frac{c}{2}\)
3
\(\cos \left(\frac{A-B}{2}\right)\)
4
\(\sin \frac{c}{2}\)

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