Q. We are given that dxdy=x2−2y.Find an expression for dx2d2y in terms of x and y.dx2d2y=
Given First Derivative: We are given the first derivative (dxdy)=x2−2y. To find the second derivative (dx2d2y), we need to differentiate (dxdy) with respect to x.
Apply Chain Rule: Using the chain rule, we differentiate dxdy with respect to x. The chain rule states that the derivative of y with respect to x is the derivative of y with respect to an intermediate variable (like u) times the derivative of that intermediate variable with respect to x.dx2d2y=dxd(x2)−dxd(2y)
Differentiate Terms: Differentiate x2 with respect to x to get 2x. (d2y)/(dx2)=2x−d/dx(2y)
Product Rule Application: To differentiate 2y with respect to x, we use the fact that dxdy=x2−2y. We apply the product rule to the constant 2 and the function y. dx2d2y=2x−2(dxdy)
Substitute Expression: Substitute the expression for dxdy into the equation.dx2d2y=2x−2⋅(x2−2y)
Simplify Expression: Simplify the expression by distributing the −2 and combining like terms. dx2d2y=2x−2x2+4y
Final Second Derivative: The final expression for the second derivative in terms of x and y is: dx2d2y=−2x2+2x+4y
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