$2x^2-3x^2+4x-6$
$\sqrt{53}\cos\left(x-15\right)=-5$
$1-8f+16$
$\frac{2}{9}-\left|\frac{5}{4}+\left(\frac{7}{5}.\frac{3}{2}\right)\right|+\frac{2}{3}$
$\frac{z}{7}-6\ge-5$
$\frac{dy}{dx}=\frac{y+4}{x-3}$
$\frac{sin^2b}{1-\cos b}=1+\cos b$
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