$\frac{dy}{dx}=\left(4+x\right)^2$

$\left(7xy-4\right)\left(6x+5y-2\right)$

$-a^2-5a^2-3a^2$

$\frac{5}{-\infty}$

$\cot\left(a\right)=\frac{\csc\left(a\right)}{\sec\left(a\right)}$

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

$\left(9n-4m\right)^2$