$2\sin\left(2x\right)-3\sin\left(x\right)=\:0$

$\frac{12}{x-3}+\frac{x}{2}=7$

$\lim_{x\to\infty\:}\left(\left|-\frac{\cos\left(\pi x\right)}{x}\right|\right)$

$16x^6-x^2$

$\left(2z-\frac{1}{z}\right)^2$

$\frac{\tan\left(x\right)\:.\:\coth\left(x\right)}{\cos\left(x\right)}$

$11x+12=9x-32$