$\lim_{x\to\infty}\left(\frac{x^2-3}{x^2+x}\right)^{2x+1}$
$3+15\cdot7$
$\lim_{x\to\infty}\left(\frac{-x}{13e^{13x}}\right)$
$\frac{15}{3}+\frac{13}{5}+\frac{8}{15}+1\frac{13}{15}$
$x-1;\:x=2$
$\int_0^{60}\left(x\right)dx$
$du+5udu=5xdx$
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