$\cos\left(x\right)+\cos\left(2wy-x\right)$
$12:-6$
$\frac{12x^3+10x^2+5x+3}{3x+1}$
$-6\:\left(7g\:-\:8\right)$
$-4x^2+2x-7$
$4\:x^2\:+8\:x\:+3=0$
$\frac{d}{dx}5\:\:^x$
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