$tan\left(2x\right)=2sin\left(x\right)cos\left(t\right)sec\left(2x\right)$
$2\left(6k+9\right)$
$\left(1-8c\right)^3$
$18x+x^2+4$
$f\left(x\right)=1+\frac{2}{x}$
$y^2-2y-15=0$
$\frac{x-2}{x^2-4x}$
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