[" 23.If "x=a(cos theta+log tan(theta)/(...

[" 23.If "x=a(cos theta+log tan(theta)/(2))" and "y=a sin theta," show that the value of "(d^(2)y)/(dx^(2))" at "],[theta=(pi)/(4)" is "(4)/(a)quad " (c-BSE "2009," ,"13]]

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