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

[" 47.If "tan A=(1-cos B)/(sin B)" ,then "],[[" (a) "tan2A,=tan B],[" (b) "tan2A,=tan^(2)B],[" (c) "tan2A,=tan^(2)B+2tan B],[" (d) "tan2A,=1+tan B]]

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