$\lim_{x\to0}\left(\frac{1+\cos\left(3x\right)}{\left(x-\pi\right)^2}\right)$

$\left(3a-1\right)\left(3a+2\right)$

$\frac{d}{dx}\left(\left(sinxy^2\right)\right)=x^22y^2$

$20abc+15a^2c^2-ac$

$75+78+79$

$\left(\frac{k^{-5}}{k^{-2}}\right)^{\frac{1}{12}}$

$\lim_{x\to\frac{\pi}{2}}\left(tan\left(x\right)-\frac{1}{1-sinx}\right)$