$\frac{81-x^2}{9+x^2}$
$5\cos^2x+2\sin^2x-2=3\cos^2x$
$2x^3+3x^2-2x$
$x^3y'=\frac{1}{4}y^2$
$-2^6\left(11w^28y\right)$
$5x\:-\:8\:=\:3x\:+\:30$
$x^2\le4x+12$
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