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Question

A curve is represented parametrically by the equations x=f(t)=aln(bt) and y=g(t)=bln(at);a,b>0 and a1,b1 where tR.

The value of d2ydx2 at the point where f(t)=g(t) is

A
0
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B
12
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C
1
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D
2
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