$9y-3$

$x\left(\frac{\sin\left(x\right)}{\cos^2x}\right)-\left(\frac{1}{\cos\left(x\right)}\right)\tan\left(x\right)=0$

$8\cos^2\left(x\right)-1=0$

$x^2+12x+19=0$

$\left[13+\left(-52\right)\right]\cdot\left\{\left(-9\right)\cdot\left[3+\left(8\right)\right]\right\}$

$\sqrt{16}-\sqrt[3]{1000}$

$7cot^3\left(t\right)\left(csc^2\left(t\right)-1\right)$