$\frac{x}{y\left(x^2-1\right)}=\frac{dy}{dx}$
$\int\left(\frac{3x^2}{\sqrt{25-x^2}}\right)dx$
$\cos\frac{\pi}{2}-x$
$x^4+x^2-20$
$2x\left(2x+5y\right)+5\left(2x+5y\right)$
$2a^2+5a+28$
$2-4\sin^2x=0$
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