$\frac{d}{dx}\:log\:\left(4x-9\right)$
$\int\frac{\sqrt{x^2-7}}{x}dx$
$-2\cot^2\left(x\right)=\frac{1}{\sec\left(x\right)+1}-\frac{1}{\sec\:\left(x\right)+1}$
$\left(-10\:\right)\:.\:\left(+3\:\right).\:\left(+7\:\right)\:.\:\left(-1\:\right)\:$
$xy^'+4y=x^3-x$
$z^2+10z+24$
$8x^2-48x+20$
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