$38y^0$

$\frac{\cot\left(x\right)}{sec\left(x\right)}$

$\frac{1}{2\cos\left(\frac{\pi}{6}\right)^2}$

$\frac{dy}{dx}=y-\left(1+x^2\right)\sqrt{1-x^2}$

$\frac{1}{a-1}+\frac{1}{a-3}-\frac{a-1}{a^{2}-4a+3}$

$\int\left(\frac{x^3}{x^2-16}\right)dx$

$-3\left(-7\cdot4+\right)\left(5-2-3\right)$