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Q.

If the tangent at (1,1) on  y2=x(2x)2 

meets the curve again at P, then P is

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a

(4,4)

b

(−1,2)

c

94,38

d

49,38

answer is C.

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Detailed Solution

detailed_solution_thumbnail

 2ydydx=(2x)22x(2x), so dydx(1,1)=12[12]=12 Therefore, the equation of tangent at (1,1) is y1=12(x1)2y2=x+1y=x+32 The intersection of the tangent and the curve is given by 14(x+3)2=x4+x24x 
x26x+9=16x+4x316x24x317x2+22x9=0(x1)4x213x+9=0(x1)2(4x9)=0
Since x=1 is already the point of tangency x=94 and y2=942942=964
Thus the required point is 94,38

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