$450+450$
$\sqrt{x}-\sqrt{4}:x-4$
$x\:siny+\left(x^2+y^2\right)^2+4e^y-3$
$-2\left(x+4\right)^3$
$4x+\left(-6v-2u+9v+u\right)$
$-1\frac{-1}{4}4$
$\frac{1}{\cos\left(a\right)}+\frac{1}{\cot\left(a\right)}=\cos\left(a\right):\left(1-\sin a\right)$
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