$ln\left(1-cos\left(2x\right)\right)$
$-10x+x^2-6x^2+18x+x^2+3x+2x^2+10x$
$y-\frac{dy}{dt}+3=0$
$2-4cos2\:-\:2\:senx\:$
$\left(x-0.9\right)\left(x+0.9\right)$
$-88.02+0,067$
$\sec\left(c\right)-\cos\left(c\right)=\sin\left(c\right)\tan\left(c\right)$
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