$x^2-x^{-2}=0$
$\left(6a^2-5ab-4b^2\right)+\left(13a^2+2b^2-4ab\right)$
$-6x^3-x^3$
$\frac{dy}{dx}=\frac{x}{\sqrt{y}}$
$\int\left(10x^4\left(2x^5-5\right)^3\right)dx$
$-3x\:+\:3y=5$
$-a+a+2a+3a-a$
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