$t=\:cos\:\frac{\pi}{17}+cos\:\frac{2\pi}{17}+cos\:\frac{3\pi}{17}....+cos\:\frac{16\pi}{17}$
$\left(-52\right)+\left(-48\right)-\left(+34\right)-\left(53\right)$
$-\infty-\infty-\infty$
$\sqrt{72^2}$
$2^3x\:2^2$
$x+4>-2$
$\left(3x+y^2\right)^5$
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