$6x^2+11x+4=0$

$\lim_{x\to infinity}\left(\frac{6x}{e^x}\right)$

$f\left(x\right)=\sin^{-1}\left(x\right)\left(3x+1\right)$

$\int_0^{\frac{\pi}{6}}\left(\frac{1}{cos^3x}\right)dx$

$[\left(x+2\right)\left(x-2\right)\left(x^4+4\right)]^3$

$4sin^4x+1=5sin^2x$

$3\cos\left(2x\right)+\cos\left(x\right)-2=0$