$\int\frac{e^{\frac{-1}{x}}}{x^2}dx$
$\left(-1\right)\:x\:\left(-1\right)\:x\:\left(2\right)\:x\:\left(-2\right)\:x\:\left(-2\right)\:x\:\left(2\right)\:$
$18a^3by-6by$
$\lim_{x\to15}\left(\frac{9x-15}{x-15}\right)$
$\cos^2\left(\frac{\pi}{4}-x\right)-\sin^2\left(\frac{\pi}{4}-x\right)$
$10\left(8x-9y+5\right)$
$2x^2\ge-20x-90$
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