$440-\left|30+6\left(19+2\right)\right|$
$4\:sec^2-7\:tan^2x=3$
$\int\cos^5\left(-7x\right)dx$
$2\left(5x-3\right)=9x+7$
$\left(-1\right)^{15}$
$0,2m-0,02n+1,07m-1,03n-1m-1n$
$m\cdot4\ge20$
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