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[" 78.If "x=a(cos t+log tan(t)/(2))" and...

[" 78.If "x=a(cos t+log tan(t)/(2))" and "y=a sin t],[" find "(d^(2)y)/(dt^(2))" and "(d^(2)y)/(dx^(2))" .All india "2012]

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