$\frac{1-\sin\left(x\right)\cos\left(x\right)}{\cos\left(x\right)}$
$\frac{16}{-2}\cdot\frac{-9}{-3}$
$7x-12=3x+4$
$\int_0^{\frac{1}{2}}\sec^2\left(\frac{\pi}{2}t\right)\tan\left(\frac{\pi}{2}t\right)dt$
$f\left(x\right)=-x^3+3x^2+18x$
$4x-15\le-17x-3$
$2=-3$
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