$4\left(x+y\right)^2+6\left(4y-5\right)^2$

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

$\int_{-\pi}^{\pi}\left(sin\left(2x\right)cos\left(3x\right)\right)dx$

$\left(2y^2x+3\right)dx+\left(2yx^2+4\right)dy=0$

$6-\left(\frac{9}{5}-\frac{8}{3}\right)$

$+4+3-a-b-a+-b-a+b$

$\left(4\right)^{3-4}-1$