$\lim_{x\to\frac{\pi}{2}}\left(\frac{tan\left(\frac{\pi}{2}\right)}{\sec\left(\frac{\pi}{2}\right)}\right)$

$6\frac{dy}{dx}=e^{3x+2y}$

$\frac{3z-2}{-5}<6$

$27-27a^2+9a^2-a^3$

$4\frac{dy}{dx}=e^{3x+2y}$

$4\sin\left(3x\right)+\sin\left(x\right)+\sin\left(2x\right)$

$\left(a+64\right)^2$