$87\cdot5$
$\frac{dy}{dx}\left(x^2+y^2\right)=yx$
$-4\:\:x\:\:-1$
$6\frac{dy}{dx}-8y=2\cos\left(3x\right)$
$\left(4x-\frac{1}{5}y^2z^3\right)^2$
$x^3\:+\:x^2-x\:-1$
$\lim_{x\to\infty}\left(-x\cdot\:cos\left(x\right)+sin\left(x\right)\right)$
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