$sen+cos=\frac{\sqrt{3}}{2}$

$\left(x+4\right)+\left(2x+5\right)$

$x^2\cdot\frac{dy}{dx}=x\cdot y+y^2-x^2$

$-4+3-5+2-8-3+7$

$\int\frac{1}{\left(x^2+1\right)\left(3x^2+x^3\right)}dx$

$-5\left(-6n-4\right)+7$

$\int_{-3}^3\left(\left(x^2-9\right)-\left(-x^2+9\right)\right)dx$