$19\:+\:\left(-18\right)\:-\:6\:+\:\left(-15\right)\:-\:\left(-3\right)$
$\:y^{-4}z^5\:$
$\tan\frac{y}{2}=\csc y-\cot y$
$10x^2-20k$
$\frac{dy}{dx}=\frac{xe^y}{2t-1}$
$\frac{d}{dx}\frac{4\sin\left(x\right)}{3\cos\left(x\right)}$
$-34+-25+-9+488$
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