$4\cos\left(x\right)=1+2\cos\left(x\right)$
$\cos\left(0\right)\frac{4}{7}$
$-7x^2+12x+36$
$4a^2x^2-9y^2$
$\left(3-7x\right)^2$
$\frac{6x^3-17x^2+16}{3x-4}$
$196n^2-144$
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