$4\left(3y+3\right)+5$
$4\left(\infty^4-\infty-6\right)$
$\frac{\frac{N}{N}}{\frac{1}{N}}$
$sec^6x\tan^4x$
$-17=-12$
$\frac{sin^2\left(x\right)-cos^2\left(x\right)}{1-2cos^2\left(x\right)}$
$6x-3y-z+2x+3y-7z$
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