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If A ,\ B ,\ C are the interior angle...

If `A ,\ B ,\ C` are the interior angles of a triangle `A B C` , prove that `tan((C+A)/2)=cotB/2` (ii) `sin((B+C)/2)=cosA/2`

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RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS-All Questions
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  18. What is the maximum value of 1/(cos ec \ theta)?

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