$\left(6x^2+2y^4\right)\left(6x^2-2y^4\right)$
$7.2-8.24+0.5$
$\frac{3x^3-6x^3-9x^1-18}{3x^1-1}$
$\int\:\frac{2x}{\left(1-x\right)^7}dx$
$\int\frac{9x^2}{\left(121+x^2\right)^2}dx$
$f\left(x\right)=\sqrt{\frac{3}{x-6}}$
$\sin^2\left(50\right)+\cos^2\left(30\right)$
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