$\int\left(\frac{-2+5x+5x^2}{5}\right)dx$

$6b+4a-2a^2+b^2;\:a=7;\:b=6$

$y=sen\left(\frac{1}{2}x^{-6}-x^{-5}+x-1\right)$

$\frac{dy}{dx}\cot\left(x\right)+\tan\left(y\right)=0$

$\left(4-abc\right).\left(4+abc\right)$

$\left(x+2\right)^2\left(\sqrt{x^2+2}\right)$

$\frac{dy}{dx}\left(y=\arccos\left(3x\right)\right)$