$-14x^2+7=0$
$\left(\sec x+1\right)\left(\sec x-1\right)=sec^2x-1$
$x^3+y^3=126$
$\left(\left(1+0.0215\right)^{\frac{1}{60}}-1\right)$
$16cos^2x+49+16sin^2x$
$\lim_{x\to\infty}\left(\frac{\ln x^6}{x^6}\right)$
$\frac{6}{\left(x-3\right)\left(x-1\right)}$
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