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[" 17.fererfy fa (Show that) ":(tan((pi)...

[" 17.fererfy fa (Show that) ":(tan((pi)/(4)+A)+tan((pi)/(4)-A))/(tan((pi)/(4)+A)-tan((pi)/(4)-A))=csc2A],[" 18.fergisy fa (Show that)."]

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Prove that: (tan(pi/4+A)+tan(pi/4-A))/(tan(pi/4+A)-tan(pi/4-A))="cosec"2A

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