$\left(-11\right)-3\cdot\left(-4\right):\left(-6\right)-\left(-9\right)$

$\left(\frac{6x^3y^{-2}z^2}{3x^{-2}y^0z^3}\right)^{-2}$

$tan^4x-2tan^2csc^2x+csc^4x$

$\left(1-\frac{3xy}{4}\right)^2$

$\frac{d^3}{dx^3}\ln\left(\cos\left(x\right)\right)$

$\frac{4m}{2m+5}-\frac{5m+6}{2m+5}$

$x+6\le14$