$\left(\frac{1}{2}x-2z\right)^2$
$-1-\left(-3\right):\left(-3\right)$
$-35x+20x^2-1$
$\sec\left(a\right)=\csc\left(2b\right)$
$2^3\cdot11$
$\cos\left(3x^2+5x\right)$
$5x'+4x=16$
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