If x^2+y^2=t+frac{1}{t} and x^4+y^4=t^2+frac{ | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) Given, $x^4+y^4=t^2+\frac{1}{t^2}$.We know that $(t+\frac{1}{t})^2 = t^2 + \frac{1}{t^2} + 2$.Thus, $t^2 + \frac{1}{t^2} = (t+\frac{1}{t})^2 - 2$.

Vedclass · Accepted Answer

$-1$

Vedclass · Answer

(A) Given, $x^4+y^4=t^2+\frac{1}{t^2}$.We know that $(t+\frac{1}{t})^2 = t^2 + \frac{1}{t^2} + 2$.Thus, $t^2 + \frac{1}{t^2} = (t+\frac{1}{t})^2 - 2$.Substituting the given values, we get $x^4+y^4 = (x^2+y^2)^2 - 2$.Expanding the right side: $x^4+y^4 = x^4 + y^4 + 2x^2y^2 - 2$.Subtracting $x^4+y^4$ from both sides, we get $0 = 2x^2y^2 - 2$, which implies $x^2y^2 = 1$.Therefore, $y^2 = \frac{1}{x^2} = x^{-2}$.Differentiating both sides with respect to $x$: $\frac{d}{dx}(y^2) = \frac{d}{dx}(x^{-2})$.$2y \frac{dy}{dx} = -2x^{-3} = -\frac{2}{x^3}$.Dividing by $2$, we get $y \frac{dy}{dx} = -\frac{1}{x^3}$.Multiplying both sides by $x^3$, we get $x^3 y \frac{dy}{dx} = -1$.

If $x^2+y^2=t+\frac{1}{t}$ and $x^4+y^4=t^2+\frac{1}{t^2}$, then $x^3 y \frac{d y}{d x}$ is equal to

Similar Questions

If the axes are rotated through an angle $\alpha$,then the number of values of $\alpha$ such that the transformed equation of $x^2+y^2+2x+2y-5=0$ contains no linear terms is

Which of the following is a correct statement?

Suppose the gravitational force varies inversely as the $n^{th}$ power of distance. Then the time period of a planet in circular orbit of radius $R$ around the sun will be proportional to

Leaching of $Ag_2S$ is carried out by heating it with a dilute solution of

The suspension of slaked lime in water is known as

Vedclass Test Series

Exam Paper Generator

Online Exam Module