$\left(1-y^2\right)dy=x^2dx$

$5\tan\left(y\right)-4=0$

$\frac{tgx-\frac{1}{cosx}.cscx}{tgx-\frac{1}{cosx}.cscx}$

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

$\left(m^{3a+6}\right)^2$

$1.9=x$

$2879-579+753-978-897$