If y^2=a^2 ^2 x+b^2 ^2 x, show that y+d^2 y d x^2 =a^2 b^2 y^3 - Vidyadip

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If $y^2=a^2 \cos ^2 x+b^2 \sin ^2 x$, show that $y+\frac{d^2 y}{d x^2}=\frac{a^2 b^2}{y^3}$

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