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Question

Find the equation of tangent in 1st quadrant to the circle x2+y2=16 at (2,23)
42921_8e108c3a0c804752bed3c170b405bcc1.png

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Solution

The given circle is x2+y2=16
The slope of tangent of circle is 2x+2ydydx=0dydx=xydydx(2,23)=13

The equation of tangent is y23=13(x2)3y6=x+2x+3y8=0

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