$\frac{dy}{dx}=\frac{-\left(x^2+y^2\right)}{xy}$
$\int_4^{\infty}\left(\frac{6cos\left(\frac{\pi}{x}\right)}{x^2}\right)dx$
$81x^4-18x^2+49x^4$
$\int\left(ln\left(2x+5\right)\right)dx$
$6x-4>5x+6$
$\left(-.25+1.75i\right)^2$
$\int_2^34x-5dx$
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