trigonometry

Question: In $\Delta \,ABC$ , $a=2cm,b=3cm$ and $c=4cm$ , then angle A is

1) ${{\cos }^{-1}}\left( \frac{1}{24} \right)$

2) ${{\cos }^{-1}}\left( \frac{11}{16} \right)$

3) ${{\cos }^{-1}}\left( \frac{7}{8} \right)$

4) ${{\cos }^{-1}}\left( -\frac{1}{4} \right)$

Solution:

Explanation: No Explanation

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