$\frac{\sin\left(5x\right)+2\sin\left(x\right)\cos\left(x\right)-\sin\left(x\right)}{\sin\left(2x\right)}$

$18x^3-12x^2+8x$

$\frac{a^3+a}{a+1}$

$\int\frac{sin2x}{\left(sinx\right)^{\frac{4}{3}}}dx$

$\sqrt{\left(-6\right)}^2+1^2$

$\frac{x}{3}-\frac{x}{5}=\frac{8}{15}$

$12y^2+x\:-\:6y^2-3y^2$