$\frac{dy}{dx}+\frac{y}{20}=6.6$

$cos\left(t\right)\left(\frac{sin\left(h\right)}{h}\right)+sin\left(t\right)\left(\frac{cos\left(h\right)-1}{h}\right)$

$\lim_{x\to6}\left(\frac{6x^2-36x}{x-6}\right)$

$\left(3m^2-2n\right)^3$

$\frac{\frac{21}{17}+3}{4}+\frac{\frac{21}{17}+6}{3}=2\left(\frac{21}{17}+1\right)$

$7+1.5$

$2x-24f$