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Question

The tangent of circle x2+y22x4y+1=0 at (1,0) is

A
y=0
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B
x=0
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C
x+y=0
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D
none
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Solution

The correct option is A y=0
The equation of circle is x2+y22x4x+1=0
The Point is (1,0)
The slope of tangent is 2x+2ydydx24dydx=0(y2)dydx=1xdydx=1xy2dydx(1,0)=0
Equation of tangent is y0=0(x1)y=0

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