$\left(-9n-2j\right)\left(-10a+9w\right)$

$\frac{1}{25}a^6+4a^2$

$\frac{2x^4+6x-3}{2x-4}$

$\int_0^{\frac{\pi}{2}}\left(\:cos^2\left(3x\right)\right)dx$

$\frac{dy}{dx}=\frac{x^2+4}{y^2-5};\:y\left(0\right)=1$

$-\left(3x_{-9}\right)$

$\left(x^2+3x-2\right)-\left(3x^2+2x-1\right)$