$\frac{1}{sin\left(x\right)\cdot tan\left(x\right)}$

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

$17x+9x^{3}+24x^{2}+3\times3x+1$

$\lim_{x\to+\infty}\frac{3x^2}{e^{2x}}$

$x+11xy+28y^2^2^2^2^2$

$f\:\left(x\right)=\frac{\sqrt{x-1}}{x-1}$

$-2x^2+2x+3$