$\sin\left(171.887\right)$
$e^{-\left(x+y\right)}$
$x^4-19x^2-6x+72$
$\left(4x^2y\right).\left(9x\right)$
$\frac{1-\sin^2}{\sin}\cdot\sec=\cot$
$a^2-6a^2-1$
$x^2-120x=-110$
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