$9x^4+4x^2+8x+12-x^3-7x^2+5$
$e^x\frac{dy}{dx}=2$
$\frac{1+\cot\left(x\right)}{\sec^2\left(x\right)}=\cot^2\left(x\right)$
$1.5-\left(-3.7\right)$
$8m-4f$
$\frac{9a^7b^5c^{11}}{27a^3c^7b^{-2}}$
$\left(t^3-xy\right)\left(t^3+xy\right)$
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