$-\left(+6\right)-\left(-2\right)$
$\int\frac{1}{x^2\sqrt{121-x^2}}dx$
$7x=-21$
$8x-7=33$
$\lim_{n\to\infty}\left(\frac{n^2+1}{n^2+5}\right)^{2n+1}$
$\frac{7xy}{7}$
$\lim_{x\to3}\left(\frac{\sqrt{1-\cos\left(x-3\right)}}{\sqrt{x^2-6x+9}}\right)$
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