$\pi\int_1^3\left(\frac{1}{x}\right)^2dx$
$m+4+3m-6-2m+mc-4mc$
$\left(1+x^2\right)\:\frac{dy}{dx}-xy=x^3+x$
$\:-\left(-15\right)\:-\:\left(-9\right)$
$+\:2\:-\:7\:+\:4\:+\:5$
$sin^2x-cos^2x+1$
$x^2+9x+81\ge0$
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