$20>2x+5$

$\frac{d^2}{dx^2}\left(\frac{x}{x+y}\right)$

$\frac{2}{5}h+\frac{4}{25}h^2-\frac{2}{15}h^3$

$\int\:\frac{\left(x^3+x+4\right)}{\left(x+1\right)\left(x^2+1\right)}dx$

$\frac{a^2}{4}-ab+9$

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

$-0,55-\:-1.2$