$cos^2\left(\frac{\pi}{7}\right)-sin^2\left(\frac{\pi}{7}\right)$
$\frac{3}{4}2x$
$x^2dx+y^2dy=0$
$\lim_{x\to-2}\left(\frac{\tan\left(\pi x\right)}{\pi\left(x+2\right)}\right)$
$-16v^2+72>25$
$\frac{1024x^{10}}{2x-1}$
$y=\frac{3}{2}x-\frac{1}{4}$
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