$91,36-15$
$\left(17ab\right)\left(-4b^2\right)$
$-6\left|4\right|$
$\left(\frac{7}{9}tan\left(x\right)+\frac{7}{9}sec\left(x\right)\right)\left(\frac{2}{3}tan\left(x\right)-\frac{2}{3}sec\left(x\right)\right)$
$\frac{\left(-\infty\right)^3-1}{2-\left(-\infty\right)^2}$
$5x+2+3x^{4}\cnte8x^{2}-27$
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