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In a Delta ABC, If tan .(A)/(2)=(5)/(6)...

In a `Delta ABC, ` If `tan .(A)/(2)=(5)/(6) and tan .(B)/(2) =(20)/(37)`, then show that ` tan ((C)/(2))=(2)/(5)`

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`tan . (C)/(2)=(2)/(5)`
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