$-2y-6\left(6z-4y\right)+3z$
$\sin\left(2a\right)-2\sin\left(a\right)$
$\frac{1}{\sqrt{c}+d}$
$\int\frac{4x-1}{x^2-2x-3}dx$
$\frac{1}{\tan\left(2x\right)+\cot\left(2x\right)}=\frac{1}{2}\sin\left(4x\right)$
$y^4+13y^2+36y$
$-15+-26+\:17$
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