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[" WORKING RULE : Use Lne "],[" are requ...

[" WORKING RULE : Use Lne "],[" are required."],[qquad [" EXAMPLE 5.If "cos^(2)A-sin^(2)A=tan^(2)B" ,prove that "],[2cos^(2)B-1=cos^(2)B-sin^(2)B=tan^(2)A]]

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