$\left(\frac{\left(1+2^n\right)}{1+3^n}\right)\cdot x^n$
$\left(-3a\:+\:4ab\:-\:2b\right)\:+\:\left(5b\:-\:ab\:+\:a\:-\:3c\right)$
$x+1\sqrt{\left(x^2+2\right)}$
$\left(\frac{1}{2}+\:4x\right)^3$
$\left(5y^3+4\right)^3$
$f\left(x\right)=\:sinx\left(x+sinx\right)$
$12ab^3+2ab^3-7ab^3$
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