$\csc x\sec x=2\csc2x$

$\frac{4\sin\left(t\right)+2\tan\left(t\right)}{\tan\left(t\right)}$

$\int x^9e^{4x}dx$

$a^2-0a+12$

$2\int_0^1\left(\frac{1}{\left(a^2+x^2\right)^{\frac{3}{2}}}\right)dx$

$\lim_{x\to3}\left(\frac{x^3+2x+4}{x^2-9}\right)$

$-1\int\sqrt{1-\sin\left(2x\right)}dx$