$-2^2+4\cdot2$
$16-8y$
$-2^1$
$\frac{x^2-3x-28}{x^2-16}$
$2xy'-\ln\left(x\right)^3=0$
$\left(a+2\right)\:^3$
$1-\tan^2\left(x\right)+tan^4\left(x\right)$
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