Q. If −y3+2y−x3−3=0 then find dxdy at the point (1,−2).Answer: dxdy∣∣(1,−2)=
Implicit Differentiation: To find the derivative of y with respect to x, dxdy, we need to implicitly differentiate the given equation with respect to x.
Solving for (dxdy):</b>Differentiatebothsidesoftheequationwithrespectto$x. Remember that when differentiating y terms with respect to x, we treat y as a function of x and use the chain rule to include (dxdy).Differentiating −y3 with respect to x gives us −3y2(dxdy).Differentiating 2y with respect to x gives us y1.Differentiating y2 with respect to x gives us y4.Differentiating y5 with respect to x gives us y7, since it's a constant.So, the differentiated equation is y8.
Substitution and Calculation: Now, we solve for (dy)/(dx) by isolating it on one side of the equation.Group the terms containing (dy)/(dx) together: (−3y2+2)(dy)/(dx)−3x2=0.Add 3x2 to both sides: (−3y2+2)(dy)/(dx)=3x2.Divide both sides by (−3y2+2) to get (dy)/(dx)=3x2/(−3y2+2).
Substitution and Calculation: Now, we solve for dxdy by isolating it on one side of the equation.Group the terms containing dxdy together: (−3y2+2)dxdy−3x2=0.Add 3x2 to both sides: (−3y2+2)dxdy=3x2.Divide both sides by (−3y2+2) to get dxdy=−3y2+23x2.Substitute the given point (1,−2) into the equation to find the value of dxdy at that point.dxdy=−3(−2)2+23(1)2.dxdy0.dxdy1.dxdy2.dxdy3.
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