$\lim_{x\to\frac{\pi}{2}}\left(\left(x-\frac{\pi}{2}\right)\cdot tanx\right)$
$14\left(x-2\right)+5\left(x-2\right)$
$17c+6c$
$5\left(3^2\right)-3\left(1^3\right)+6\left(4^2\right)$
$\int2\:cos^{\pi x}\:\sin\pi x\:dx$
$100^2-70^2$
$\sqrt{245}$
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