$\left(\frac{9x^4}{16x^2}\right)$

$\left(x+2\right)^2<-x$

$\sin\left(x\right)-\sin^3\left(x\right)$

$5x-4y=-8$

$\sqrt{\left(0-6\right)^2+\left(0-3\right)^2}$

$\int\left(\frac{x}{\left(0.2-0.2x\right)\cdot\left(0.5-0.4x\right)}\right)$

$\frac{d}{dx}-7x^5+8x^4-9x^2-7x$