$1-\left(4^2\right)-1$

$\left(-5\right)^2-\:30$

$\lim_{x\to infinity}\left(\frac{11x}{11x+5}\right)^{2x}$

$tan\left(t\right)+\frac{1}{tan\left(t\right)}=\frac{1}{sin\left(t\right)cos\left(t\right)}$

$\{ ( 4 - 6 ) + 2 ( 2 \cdot - 3 + 5 ) - 2 \}$

$\log\left(5x\:+\:3\right)=\:\log\left(2x-1\right)$

$\:\left(-4v-7z\right)^3$