$59-\left(-28\right)$
$\left(y^2+1\right)\left(x^2+1\right)dx\:+\:\left(x^2-x\right)dy=0$
$\frac{d}{dx}y=x=3$
$\frac{1-2cosx-cos^2x}{sin^2x}=\frac{1-cosx}{1+cosx}$
$\left(\frac{0.85}{-8}\right)\:\left(7\right)$
$\left(\frac{1}{2}x+y\right)^2$
$-x+2x+8$
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