$\lim_{x\to\infty}\left(\frac{x+sinx}{x^2}\right)$

$xy\:\frac{dx}{dy}=c$

$\int\left(\sec\left(x\right)\right)^5\cdot\left(\tan\left(x\right)\right)^2$

$\frac{1}{1-\sin^2a}=1+\tan\left(a\right)$

$-28+\left(-5\right)^2$

$-\left(+6\right)+\left(+4\right)-\left(-7\right)$