Tính $x,y$ trong hình vẽ sau:

$\tan \alpha  = \sin \beta $

$\tan \alpha  = \cot \beta $

$\tan \alpha  = \cos \alpha $

$\tan \alpha  = \tan \beta $

\(x = \sqrt a \)

\(\sqrt x  = a\)

\({a^2} = x\,\) và \(x \ge 0\)

\({x^2} = a\,\) và \(x \ge 0\)

$\sqrt[3]{a} = x \Leftrightarrow {a^3} = x$            

$\sqrt[3]{a} =  - x \Leftrightarrow {a^3} =  - x$

$\sqrt[3]{a} = x \Leftrightarrow a = {x^3}$

$\sqrt[3]{a} =  - x \Leftrightarrow a = {x^3}$

$x \approx 8,81$

$x \approx 8,82$

$x \approx 8,83$

$x \approx 8,80$

$\dfrac{9}{{13}}$

$\dfrac{9}{{169}}$

$\dfrac{3}{{13}}$

$\dfrac{{13}}{9}$

$A{H^2} = AB.AC$

$A{H^2} = BH.CH$

$A{H^2} = AB.BH$

$A{H^2} = CH.BC$

\(\tan C \approx 0,67\)

\(\tan C \approx 0,5\)

\(\tan C \approx 1,4\)

\(\tan C \approx 1,5\)