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  1. $$\sqrt{\frac{3}{2}}$$
  2. $$\sqrt{\frac{2}{3}}$$
  3. $$\sqrt{2}/3$$
  4. $$\sqrt{\frac{sin 60°}{sin 60°}}$$

\begin{array}{lcc}\left(c\right)\left|x\right|<\frac54

\left(c\right)\left|x\right|<\frac45\end{array}

 

 

\begin{array}{lcc}\left(a\right)&x<1&{}\\\left(b\right)&\left|x\right|<1&{}\\\left(c\right)&\left|x\right|<\frac54\left(d\right)&\vert x<\frac45\end{array}

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