$\frac{dx}{dt}=-\frac{2x}{30-t}$
$44+\left(-10\right)+13$
$\frac{seca\left(1+sina\right)}{4\left(sina+sin^2a\right)}=\frac{1}{2}csc2a$
$\lim_{x\to\infty}\:\frac{5x^4+1}{x^4}$
$x^2+5x+6>0$
$\left(2a-3b+c\right)\left(2a-3b-c\right)$
$\frac{4+2x}{x^2}$
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