$\left(81a\right)^{\frac{3}{4}}$

$\lim_{x\to\infty}\left(\sqrt{\frac{3x^2+10x}{\left(x^2+1\right)\left(x-1\right)}}\right)$

$3x^2+3x-4=0$

$\frac{sinx}{\cos\left(x\right)+1}+\frac{\cos\left(x\right)-1}{\sin\left(x\right)}=0$

$\frac{a^4+a}{a+1}$

$-3x^2-4x-1$

$\frac{tan\left(x\right)}{sin\left(2x\right)}\:=\frac{1}{2\left(1-cos^2x\right)}$