$cos^2\left(x\right)+sin^2\left(x\right)cos\left(x\right)$
$15x^4-25x^3$
$x+1+2x+2\:3x-3$
$\left(2\right)\left(3x\right)^2$
$\lim_{x\to0}\left(\frac{1-\cos\left(x\right)}{\left(e^2-1\right)^2}\right)$
$3+10-12+3-12+4+1+13$
$3x^2+2x-3=0$
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