$\int\frac{4\:+5x^2}{4x+x^3}dx$

$\int\frac{u}{\left(2+u\right)^2}dx$

$\frac{cos\left(x\right)^2}{sin\left(x\right)}=cot\left(x\right)cos\left(x\right)$

$\left(x-5xy+3y\right)^{\left(2\right)}$

$\sin\left(45+a\right)-\cos\left(a-45\right)$

$94x^2+12x-16$

$x^2+\left(y-3\right)^2=4$