$\int\frac{1}{x^7\sqrt{2-x^2}}dx$
$\int x^{11}\left(x^6+3\right)^{.5}dx$
$\int e^{ax}.\cos\left(b\right)xdx$
$\left(19x+4y\right)\left(19x-4y\right)$
$6-4\left(8x-1\right)$
$5x^2-25=0$
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