$\lim_{x\to0}\left(\frac{lnx}{x^2+1+9x}\right)$
$200-52+75$
$\lim_{x\to\infty}\:x\cdot\ln\left(1-\frac{1}{x}\right)$
$81x^2-ax=0$
$\int\frac{1}{senx^4\cos x^2}dx$
$3x^2+2x-1+3x^2+2x-1+3x^2$
$\frac{dx}{dt}=\frac{t^2-1}{x^2+1}$
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