$.4^2$
$15a^{2}b^{3}c+a^{3}b^{2}b$
$\lim\:_{x\to\:\:0}\:\frac{9x^2}{ln\left(sec\:x\right)}$
$4v^{3}\sqrt{w^{9}}$
$\left(-2\right).5-2.\left(-4\right)$
$-4h^2+11h+3$
$\frac{9^2}{4}-ab+b^2$
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