$\left(3r^3+5a^4\right)^2$

$2\frac{0}{2}$

$e^2^{-2x+1}$

$\int e ^ { \frac { 1 } { 4 } x + 1 } d x$

$\int e^{2x}\cdot cos\left(3x\right)dx$

$\int_{-\pi}^{\pi}sin\left(t\right)dt$

$\frac{-1+\csc\left(a\right)\frac{1}{\cos\left(a\right)}\tan\left(a\right)}{\tan\left(a\right)}=\tan\left(a\right)$