$\frac{\left(cos\left(x\right)+sin\left(x\right)\right)\left(cos\left(x\right)-sin\left(x\right)\right)}{cos^2\left(x\right)}$
$\int3f^2df$
$\frac{secx}{secx+1}-\frac{secx}{secx-1}$
$-2x\ge-8$
$\frac{dy}{dx}+y=y\left(senx+1\right)$
$\left(\:x\:+\:2\:\right)\left(\:x\:-\:9\:\right)\:$
$h\left(t\right)=12-3t^2$
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