$-7+\left(-1\right).\left(-1\right)$
$\frac{dy}{dx}=\frac{y-x+6}{y-x-2}$
$3x-8>5x+4$
$x\left(x-1\right)\left(x-3\right)\left(x-6\right)$
$\sin\left(o\right)\sec\left(o\right):\:\tan\left(o\right)$
$\frac{x-4x+3}{x-1}$
$cos\left(270+2a\right)=sin\left(2a\right)$
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