$\left(\frac{12x}{5}-6x^{2}\right)\left(\frac{12x}{5}+6x^{2}$

$\int_0^{\frac{\pi}{2}}\left(sec^2\left(\frac{x}{k}\right)\right)dx$

$49x^6-36y^2$

$2\sin\left(5a\right).\sin\left(6a\right)+2\cos\left(7a\right).\cos\left(4a\right)-\cos\left(3a\right)$

$\left(-1x^4-2y\right)dx+\left(-2x+3y^2\right)dy$

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

$\left(x+8\right)\left(x^2+3x-9\right)$