Q. If 5y+y3−y2−x3=0 then find dxdy in terms of x and y.Answer: dxdy=
Given Equation: We are given the equation 5y+y3−y2−x3=0 and we need to find the derivative of y with respect to x, which is dxdy. To do this, we will use implicit differentiation, which involves taking the derivative of both sides of the equation with respect to x, while treating y as a function of x.
Implicit Differentiation: First, we differentiate each term of the equation with respect to x. For the terms involving y, we will apply the chain rule, which states that the derivative of a function of a function is the derivative of the outer function times the derivative of the inner function. In this case, the "inner function" is y, which is a function of x, so we multiply by dxdy after differentiating with respect to y.
Differentiating 5y: Differentiating 5y with respect to x gives us 5dxdy, since the derivative of y with respect to x is dxdy.
Differentiating y3: Differentiating y3 with respect to x gives us 3y2dxdy, by applying the chain rule (the derivative of y3 with respect to y is 3y2, and then we multiply by dxdy).
Differentiating −y2: Differentiating −y2 with respect to x gives us −2ydxdy, by applying the chain rule (the derivative of y2 with respect to y is 2y, and then we multiply by dxdy.
Differentiating −x3: Differentiating −x3 with respect to x gives us −3x2, since x is the variable we are differentiating with respect to.
Combining Differentiated Terms: Now we combine all the differentiated terms to rewrite the equation: 5(dxdy)+3y2(dxdy)−2y(dxdy)−3x2=0.
Factoring out dxdy: We can factor out dxdy from the terms that contain it: (dxdy)(5+3y2−2y)−3x2=0.
Isolating dxdy: Now we isolate dxdy by adding 3x2 to both sides and then dividing by (5+3y2−2y): dxdy=5+3y2−2y3x2.
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