$-0.52\cdot0.75$

$\left(9a^2+4b^2-4c^2\right)^2$

$\frac{d}{dx}6x^3-4x^2y+3y^2-8x-7y=12$

$\frac{n+1}{n-1}+\frac{n-1}{n+1}$

$2^4\cdot9^{13}$

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

$\frac{d^2}{dx^2}\left(9e^{-x^2}\right)$