$\frac{1-\tan\left(x\right)^4}{\left(1-\tan\left(x\right)^2\right)\csc\left(x\right)^2}=\tan\left(x\right)^2$

$\sqrt{75m^4}$

$\int\:\frac{1}{-\left(x^2+1\right)}dx$

$36c^2-36cd+9d^2$

$xy'=y\left(lny-lnx\right)$

$\int\left(x^{\frac{3}{2}}+2\right)\sqrt{x}dx$