$f\left(x\right)=ln\left(2+4x\right)$

$\lim_{x\to-\infty}\left(\frac{1}{2x+1}\right)$

$\sin\left(x\right)=-0.8686$

$\sin\left(0\right)^2+\cos\left(0\right)^2$

$x\left(x+1\right)=3\left(x+1\right)$

$sm-bm+sn-bn$

$7+\left|10-\left(5-\left(6+4\right)\right)\right|-\left|15+\left(4-3\right)+\left(18-2\right)\right|-29$