$\left(2cos\left(x\right)-1\right)\left(2cos\left(x\right)-3\right)=0$
$\lim_{x\to a}xf\left(a\right)-af\left(x\right)$
$-\frac{435}{5}$
$1250-759$
$-5n+8=-7$
$3x+6x^2+15x^3$
$\frac{x}{3}-x$
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