$\left(x-2y+z\right)\left(x-2y-z\right)$
$\frac{n}{-2}>4$
$2-\cos^2x=1+\sin^2x$
$\int\left(\frac{1}{2\sqrt{x}+2x}\right)dx$
$15\cdot80+30$
$-2sen\left(2x\right)+3cos\left(x\right)=0$
$2\cdot10x^2\cdot7$
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