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In A B C ,(cot A/2+cotB/2)(asin^2B/2+bs...

In ` A B C ,(cot A/2+cotB/2)(asin^2B/2+bsin^2A/2)=` `cotC` (b) `ccotC` (c) `cotC/2` (d) `ccotC/2`

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