$16\:x^2\:+\:7y^2\:-\:3\:-\left(25x^2+1-12y^2\right)$

$\left|\left(+9\right)+\left(-23\right)\right|-\left(-11\right)$

$-7\:\cdot\:4$

$\left(e^{-y}-4x\right)dx+\left(3y^2-xe^{-y}\right)dy=0$

$\lim_{x\to0}\left(\frac{\left(1-\cos\left(x\right)\cdot\sin\left(x\right)\right)}{x^2}\right)$

$\left(7a+3b\right)^4$

$9-\left(-4\right)$