$\int\frac{x^2}{\sqrt{4-49x^2}}dx$
$113,9-47,7$
$\log\left(x\right)+\log\left(x+3\right)=1+\log\left(4\right)$
$x^2-2x-152$
$6x^3+12x^2-2x$
$61.465\cdot0.0256$
$\left(\frac{1}{7}r\:-\:\frac{3}{7}s\right)^2$
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