$\frac{d^2}{dx^2}\left(x\ln\left(1-2x\right)\right)$

$\int_0^{2\pi}\left(\sec\left(x\right)\right)dx$

$sinx\left(secx+cotx\right)=cosx$

$\left(\frac{1}{2}+\frac{1}{2x}\right)^4$

$y\sqrt{x}^21$

$3,98\cdot4,5$

$\int_0^{\infty}\left(\frac{e^{-\frac{1}{x}}}{x^2}\right)dx$