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[" 17.If "tan A=(1-cos B)/(sin B)" ,then...

[" 17.If "tan A=(1-cos B)/(sin B)" ,then tan "2A" is equal to "],[[" A) "tan B," B) "tan^(2)B," C) "tan^(2)B+2tan B," D) "tan B+2tan B]]

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