$\sqrt{7-7x^2}$
$\left(\frac{1}{t}+1\right)\left(\frac{1}{t}+1\right)$
$m^12-n^12$
$\frac{cos^2\left(x\right)}{8sin\left(x\right)\cdot\:\frac{sin\left(x\right)}{cos\left(x\right)}}$
$\:\:\left(2x^3\right)^4\cdot x^3$
$\int6\ln\left(x^2\right)dx$
$\lim_{x\to0}\left(\frac{x\:sen\:x}{1+x^2}\right)$
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