$x^8+18x^4$
$2x^2-14x+12=0$
$\cos\left(x\right)=-0.4531$
$8\sin\left(30\right)\tan\left(45\right)+\cos\left(30\right)$
$20\:x\:\left(+5\right)$
$\lim_{x\to0}\left(tan\left(x\right)\cdot tan2x\right)$
$\int\left(\frac{\left(3\right)}{\sqrt{x^2+2x}}\right)dx$
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