$2x+y+\left(x+2y\right)\cdot\frac{dx}{dy}$
$4\cdot2+16xy+16xy2$
$9x^2-9x-10$
$\lim_{x\to89}\left(\sec\left(x\right)\right)$
$-\left(-22\right)+\left(+8\right)-\left(+5\right)+12$
$x^2-36=-11$
$\frac{\sqrt{2\left(x+h\right)+1\:}\:-\:\sqrt{2x+1}}{h}$
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