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finding the equation of a tangent at a point on a curve using calculas method


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 find the equation of the tangent at (1,1) on x² +xy+2y² = 4
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diff.the given equation and extract dy/dx
find the value of dy/dx at (1,1) which gives
the value m of the slope of the tangent
use y-y1 = m(x-x1) to get the equation
 answer and  some steps are given below
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