$\int\left(\frac{x+3}{\left(x-4\right)\left(x+5\right)}\right)dx$

$\lim_{x\to\frac{\pi}{4}}\left(6\left(\tan\left(x\right)\right)^{\tan\left(2x\right)}\right)$

$0,04x^2+0,12xy+0,09y^2$

$\int_5^{\infty}\left(\frac{1}{x^2-4x}\right)dx$

$\frac{sin3x-sinx}{cosx-cos3x}=cot2x$

$24-57+67-87+9-6$

$\int\:\:x^3\sqrt[4]{3+2x^4}dx$