`(cos 3 theta)/(cos^(3) theta)+(sin 3 theta)/(sin^(3) theta)=` A)`3 csc 2 theta * cos 2 theta` B)`3 csc 2 theta * cot 2 theta` C)`12 cosec 2 theta * cot 2 theta` D)none of these
A. `3 csc 2 theta * cos 2 theta`
B. `3 csc 2 theta * cot 2 theta`
C. `12 cosec 2 theta * cot 2 theta`
D. none of these