$-7x^2+x-9x+7$
$\left(x+y\right)^2-z^2\left(x+y\right)-z$
$\int4x\cdot e^{6x}dx$
$\cot\left(64.6\right)$
$x^2+4x+3\ge0$
$-lny'=lny$
$900e^{\left(0.05\right)\left(10\right)}$
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