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[" 4.(a) If "x=log(e)tan((pi)/(4)+(theta...

[" 4.(a) If "x=log_(e)tan((pi)/(4)+(theta)/(2))" ,Prove that "],[" (i) "tanh((x)/(2))=tan((theta)/(2))],[" (ii) "cos theta*cosh x=1]

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