$-2.3\cdot10^2$
$\left(8x-2\right)\left(2x^2-8x-3\right)$
$-a+b-2b-2c+3a+2c+3a+2c-3b-2a+4b-5b-c$
$\cos x\left(\sec x-\cos x\right)=\cos^2x$
$\frac{y^5}{y^4}$
$7y+3y-4y$
$\frac{x^4}{4-x^2}$
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