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

$5k+6=11$

$3\sec\left(x\right)-\frac{1}{\cos\left(x\right)^2}=2$

$-\left(-\left(-25\right)\right)-\left(12-20\right)-\left(19-45\right)$

$\int\frac{1}{\sin^2\left(x\right)\cos^4\left(x\right)}dx$

$\frac{d}{dx}3x$

$\frac{4x}{3}<\frac{5}{2}$