$\int\left(\frac{\sqrt{x}\tan\left(x^{\frac{3}{2}}\right)}{4\pi}\right)dx$

$7,24+9,1$

$\arccos\left(\frac{x^2+a^2}{x^2+a^2}\right)$

$\int\left(x^2-8x+21\right)^{\frac{1}{2}}dx$

$\int_0^{\frac{3}{2}}\left(\frac{x}{x^2-4}\right)dx$

$\left(x^2-1\right)\left(x^2-11x+28\right)$

$\:x^2-6x-27=0$