$\left(+5\right)+\left(-3\right)-\left(-9\right)$

$+3\:.\:\left(-2\right)\:.\:\left(+1\right)\:.\:\left(-5\right)\:.\:\left(-2\right)\:.\:\left(+3\right)\:.\:\left(-1\right)$

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

$\int\left(x^2-2\right)^2dx$

$4a-9b+23a-17b$

$\frac{dy}{dx}\left(4x^2=\frac{\left(2x+1\right)}{\left(3y^3\right)}\right)$

$\cos2\left(x\right)\cos\left(x\right)-\sin2\left(x\right)\sin\left(x\right)=-\frac{\sqrt{3}}{2}$