$3x^3+2x^2+12x+8$
$a^4+a^2^2$
$-20+30-40+50-60+13-12$
$\arcsin\left(\frac{x}{4}\right)+\frac{\sqrt{16-x^2}}{x}$
$0.7\cdot5.9$
$\sqrt[2]{4y}.\sqrt[4]{8y^3}$
$-\cos a-11=2\cos a-9$
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