$5ac-15ad+4bc-12bd$
$\frac{1}{2}x^2+5$
$6x^2-23x+21$
$2\left(-1\right)^2+2\left(-1\right)-4$
$5\cos^2=4-3\sin^2$
$2.-3+7+1-4+5-12+9$
$\frac{dy}{dx}=\frac{1}{5x}$
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