$\lim_{x\to\infty}\left(\frac{x+sinx}{x^2}\right)$
$xy\:\frac{dx}{dy}=c$
$\int\left(\sec\left(x\right)\right)^5\cdot\left(\tan\left(x\right)\right)^2$
$\frac{1}{1-\sin^2a}=1+\tan\left(a\right)$
$-28+\left(-5\right)^2$
$-\left(+6\right)+\left(+4\right)-\left(-7\right)$
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