$\left(-6+i\right)\left(-5-i\right)$

$-3u-\left(-8\right)+2$

$a^2-10\:a+25\:=\left(a-5\right)^2$

$\int_0^1\left(sen\left(x+y\right)\right)dx$

$\left(2x^4\:-\:3y\right)^2\:$

$65\infty$

$\int_{\frac{-\pi}{2}}^{\frac{\pi}{4}}\left(\frac{\sqrt{2}\sin\left(4x\right)}{\sqrt{1-\cos\left(4x\right)}}\right)dx$