$8a+12+\left(-9\right)-\left(-6a\right)$
$u-2.75=6.7$
$\frac{sin\left(3x\right)}{sinxcosx}=4cosx-secx$
$\lim_{x\to\infty}\left(\frac{5x^2+3x}{e^x+2x}\right)$
$sen^2b$
$\int\left(x^6+6x^5\right)\left(6x^2+12\right)dx$
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