If and , then is…

MATHEMATICS · Subjective · A Level · Mathematics · Differentiation · Differentiation

Problem

x^2 + y^2 = t - \frac{1}{t}

and

x^4 + y^4 = t^2 + \frac{1}{t^2}

, then

\left(\frac{dy}{dx}\right)_{(1,1)}

is .....