$1-\left(-12\right)$
$\left(3\right)\left(-1\right)+0\left(8\right)$
$2\cos^2\left(16x\right)-1$
$\left(-106\right)-\left(-49\right)$
$\frac { x ^ { 9 } } { x ^ { 4 } }$
$f\left(x\right)=6x^{-1}+8x^{-2}+4\sqrt{x}-5$
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