$\left(-6\right)\cdot\left(-4\right)$

$x^2-4x+1,5$

$e^{\left(\frac{4}{h}+\frac{9}{x}\right)}$

$y=6x^2-8x+5$

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

$\cot\left(w\right)=-1.54$

$\left(2\frac{1}{2}+3\frac{2}{3}+4\frac{1}{4}\right)\left(8\frac{1}{4}+6\frac{2}{3}-4\frac{1}{2}\right)\left(9\frac{2}{3}+20\frac{1}{4}\right)$