$4x^2+7x-11$
$f\cos\left(x\right)-2f\sin\left(x\right)=1$
$\int sin^2\left(5x\right)cos^2\left(5x\right)dx$
$\frac{\cos\left(a\right)}{\cos\left(a\right)}=\sin\left(a\right)$
$12^9\cdot12^{-7}$
$\frac{2x^2+5x-7}{x-2}$
$\int\frac{x-13}{\left(x^2+8x-9\right)}dx$
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