$\frac{dy}{dx}=\frac{x\cos\left(y\right)^2}{\tan\left(y\right)}$
$3x^2+25x-30\le0$
$f\left(x\right)=\left(x+2\right)^2\sqrt{x^2+2}$
$y=x^5-2x^3+x$
$-8a-5a$
$2x\le-\frac{1}{3}$
$x^2+4\ge0$
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