$\int\frac{\left(\ln x\right)^9}{x}dx$

$\sqrt[4]{921-296}$

$\int x\cdot\arctan\left(9x\right)dx$

$b^2+2b-3$

$\frac{2.sin\left(y\right)\cdot\cos\left(d\right)+\sin\left(y\right)}{2\cdot\cos\left(y\right)\cdot\cos\left(d\right)+\cos\left(y\right)}$

$\frac{2}{x^3+1}$

$\frac{dy}{dt}=\:\frac{\left(-4\cdot x^3\right)}{\:\left(x^4\:+\:1\right)^2}$