$\frac{dy}{dx}=-2xy,\:y\left(0\right)=2$
$18x^2=65x-7$
$\left(-4+wy^4\right)\left(4-wy^4\right)$
$sin^4x=cos^4$
$\left(x^4y^2-9\right)$
$9a^2-6ab+5^2$
$y=\frac{2x^2sinx}{\left(secx\right)^{\frac{1}{2}}}$
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