$x^2+x^2y$
$-9-\left(-12\right)>3$
$cot^2s=1$
$5b+7b$
$y+1+-8$
$\left(10\cdot7\right)+\left(10-6\right)$
$\sec w-\tan\left(w\right)\sin\left(w\right)=\cos w$
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