$\frac{dy}{dx}-\frac{y}{x}=x^2$

$-12\cdot3+18$

$g\left(x\right)=2x^4+x^2-3x$

$\log_x\left(x^5\right)$

$\frac{sin^2x}{\left(1-cosx\right)^2}=\frac{1+cosx}{1-cosx}$

$\frac{1+\cos\left(b\right)}{\sin\left(b\right)}+\tan\left(b\right)=\frac{1+\cos\left(b\right)}{\sin\left(b\right).\cos\left(b\right)}$

$\int_1^{\infty}\left(\frac{4}{\sqrt[8]{x}}\right)dx$