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Q.

Observe the following lists.

   List - I                                                      List - II

I. length of tangent at (1,2)                a) 25

   one the curve y=x3+1 is

II. length of normal at (1,2)                 b) 3

    on the curve y=x2+1 is

III. length of sub-tangent at                c) 2103

      any point on the curve

       y=bex/a is

IV. length of the sub normal                d) 5

      at the point (1, 1) on the

      curve y=x3 is

                                                                  e) a

Match the list I to list II and choose the correct answer.

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a

c, b, e, a

b

a, c, b, d

c

c, a, d, b

d

c, a, e, b

answer is D.

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Detailed Solution

i)    y=x3+1,  at (1, 2)

      dydx=3x2m=dydx(1, 2)m=3

         Length of tangent =y1m 1+m2

                                          =23 10

ii)   y=x2+1,   at (1, 2)

       dydx=2xm=dydx(1, 2)m=2    

        Length of normal =y1 1+m2

                                        =21+4 =25

iii)   y=b  exadydx=ba  exam=dydx(x, y) =ba y

       Length subtangent =y1m

            =yba y=ab

iv)   y=x3,  at (1, 1)

       dydx=3x2m=dydx(1, 1)=3

Length of sub Normal =y, m=3

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