$\frac{9.8sinx}{cosx}=0$
$\left(-3\right)\cdot\left(+3\right)\cdot\left(+3\right)\cdot\left(+3\right)$
$x^2-2x-4\le0$
$\left(\:x\:-\:3\:\right)\:\left(\:x\:+\:9\:\right)\:<\:\left(\:x\:+\:2\:\right)\:\left(\:x\:-\:3\:\right)$
$8-3+15-3+8-3+12$
$\lim_{x\to-3}\left(\frac{4x^2-2x-9}{x^3+27}\right)$
$\int sin\left(4x-5\right)dx$
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