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[" (iii) "(sin3 alpha)/(sin alpha)+(cos3...

[" (iii) "(sin3 alpha)/(sin alpha)+(cos3 alpha)/(cos alpha)=4cos2 alpha],[" 2."" ."max" in "(tan((pi)/(4)+A)-tan((pi)/(4)-A))/(tan((pi)/(4)+A)+tan((pi)/(4)-A))=sin2A]

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