$16\:-\:\left[16\:-\:\left(16\:-\:4\right)\right]\:+\:\left(-16\right)$

$\left(+4\right)\:+\:\left(7\right)\:+\:\left(+12\right)\:+\:\left(+16\right)$

$-\left(8a-6b-c\right)+\left(2a+8b+c\right)$

$\lim_{t\to0}\left(tan2t\right)^t$

$\int\frac{x^2}{\left(x+2\right)}dx$

$x^4y'+x^2y=2x^2$

$\lim_{x\to o}\left(\frac{sin2x}{tan5x}\right)$