question_answer

If \[\sqrt{m}=a{{e}^{\theta \cot \alpha }}\] where a and \[\alpha \]are real numbers, then \[\frac{{{d}^{2}}m}{d{{\theta }^{2}}}-4m\,\,{{\cot }^{2}}\alpha \]is equal to _________.

A)  m                               

B)  \[\frac{1}{m}\]

C)  1                                

D)  0

E)  None of these