$\frac{\cos\left(x+y\right)}{\cos\left(x\right)\cos\left(y\right)}$
$4x^2y\:+2xy^3$
$6n^6+18n^4-24n$
$18\cdot\left(-31\right)+50$
$x+3\left(-3x^4+8x^3+2x^2-4x-12\right)$
$\left(50-4y\right)dx=e^{\frac{x}{5}}dy$
$2x-y=9$
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