$x^5-4x^4+4x^3$
$pr+pt-ia^2\cdot ra-ib^2\cdot rb$
$30+x=150$
$\frac{1}{2cot\left(x\right)^{\left[2\right]}}$
$60x+x^2=800$
$\left(4x^3-6x+2\right)\cdot\left(4x^2+3\right)$
$a-a+2a^2-3a^2-1-4-4$
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