$\sqrt{45x}+\sqrt{20x}$

$\int\left(\frac{1}{2\sin\left(\frac{x}{2}\right)\cos\left(\frac{x}{2}\right)}\right)dx$

$\left(\cot x-1\right)=1-tc$

$\frac{3x-1}{5}-\frac{1}{2}\left(x+1\right)+\frac{1}{7}x<1$

$-4x\left(-2x^3+3a\right)$

$7x^2;\:x=2$

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