$\frac{\tan\left(x\right)-\csc\left(x\right)}{\csc\left(x\right)\tan\left(x\right)}$

$\frac{\sqrt{25x^2y^2}}{5}$

$-270\cdot4$

$\int_1^{+\infty}\left(\frac{x^3+l\left(x\right)}{\left(x^3+1\right)^{-1}}\right)dx$

$8-4+2-1\:$

$\left(2x-3\right)^2-3\:.\:\left(4\:x\:+1\right)\:.\:\left(2x\:+1\right)\:+\:\left(2x\:+1\right)^2$

$2^1\cdot2^5$