$\frac{\sec\left(x\right)}{\left(1-2\sec^2\left(x\right)\right)}$
$6x+\frac{y}{2}=7$
$\int\left(\frac{x-x^2}{x^3+x^2+x+1}\right)dx$
$\int\sqrt[3]{6-2x}dx$
$\left(\frac{2}{5}\cdot2y\right)^3$
$x^2-14x=0$
$-14.\:30$
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