$31x-\left(42y-52z\right)+9y-\left(30x+51z\right)+8z-\left(11z-33y\right)$
$y^2-3y+1$
$\frac{\csc\left(\sin^2\left(x\right)+\cos^2\left(x\right)\tan\left(x\right)\right)}{\sin\left(x\right)+\cos\left(x\right)}$
$-14+21-\left(-5\right)$
$\int 9 \pi z ^ { 8 } d z$
$\frac{d}{dx}-6tanx$
$\frac{252}{-21}$
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