$\frac{1}{\cos\left(x\right)\left(1+\frac{\sin\left(x\right)^2}{\cos\left(x\right)^2}\right)}$
$17+2+4$
$\int_{20}^{\infty}\left(9\cos\left(x\right)\right)dx$
$\sqrt[3]{14.6721}$
$b2-10b+9$
$8cos\left(6x\right)=4$
$-8-2+4r-2-9r+9-2$
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