$2\cdot\left(-1^2\right)-3\cdot\left(-1^2\right)+2$
$\lim_{x\to\infty}\:\:\sqrt{7x-x+x^2}$
$x^2+18x=0$
$12x+21y$
$-2\:+3\:-4$
$\frac{\:1\:+\:cot\left(a\right)}{csc\left(a\right)}\:$
$\frac{16g^4-1}{2g-1}$
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