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Q.

A function y=f(x) satisfies the following conditions
1) f(1)=1
2) The tangent at any point of the graph of f(x) cuts off on the y-axis an intercept equal to the square of the abscissa of point of tangency.
    Which of the following are correct.

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a

The graph of y=f(x) is passing through (0, 0)

b

y=f(x) represents a conic whose focus is 1,34

c

The area enclosed by  y=f(x) and the line y+3=0 is 323

d

y=f(x) has no maxima

answer is A, C, B.

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Detailed Solution

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Yy=dydx(Xx)
Its Y-intercept is ydydxx=x2
dydx1xy=x

yx=-x+c substituting(1,1)c=2
On solving y=2xx2

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A function y=f(x) satisfies the following conditions1) f(1)=12) The tangent at any point of the graph of f(x) cuts off on the y-axis an intercept equal to the square of the abscissa of point of tangency.    Which of the following are correct.