$\frac{5x^2}{2}-3+1$
$4z+z+2z$
$1849-86x+x^2$
$2x+4y-7y+1$
$\left(x^2-a^3\right)^3$
$3cos^2x+4cosx-4=0$
$\frac{\sec\theta}{1+\sec\theta}=\frac{1-\cos\theta}{\sin^2\theta}$
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