$3xy^2+2y^2+6x+4$
$b1^4$
$-2\sin\left(9x\right)^2+1$
$\left(\frac{k^{3t+2}}{k^{2+3t}}\right)^{10}$
$2\int\frac{\left(7x^3+\:12x\right)}{\left(x^2+1\right)\left(x^2+2\right)}dx$
$85x\ge5000$
$\left(2x^4+4y^3\right)^2$
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