question_answer

If\[sin3\theta =cos\left( \theta -6{}^\circ  \right)\], where\[\mathbf{3}\theta \]and\[\left( \theta -\mathbf{6}{}^\circ  \right)\] are acute angles, then \[\theta \]=?

A) \[24{}^\circ \]          

B) \[66{}^\circ \]        

C) \[36{}^\circ \]              

D) \[72{}^\circ \]

E) None of these