$tgxsen^2ydx+cos^2xcotgydy=0$
$-5+6x\ge4x+7$
$3+2+4\cdot7.5$
$-22-\left(-24\right)$
$7x-21$
$\frac{dy}{dx}=\frac{8x}{7y}$
$6n^4,\:20n^3,\:14n^2$
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