question_answer

If the angle between two lines represented by \[2{{x}^{2}}+5xy+3{{y}^{2}}+7y+4=0\]is\[ta{{n}^{-1}}m,\]then m is equal to:

A)  \[\frac{1}{5}\]                  

B)         1                            

C)  \[\frac{7}{5}\]                  

D)         7

E)  none of these