$4,05\times3,4$
$\left(x^2+y+z^3\right)^2$
$r^2-14r+33$
$f^2-12f+36$
$c\cdot c\cdot c\cdot a$
$y^2+9y=0$
$\cos\left(4a\right)=\left(\cos2a^2\right)-\left(\sin2a^2\right)$
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