What is the value of `cos[(180-theta)//2] cos[(180-9 theta)//2] + sin[180- 3 theta)//2] sin[180 - 13 theta)//2]` ?
`cos[(180-theta)//2] cos[(180-9 theta)//2] + sin[180- 3 theta)//2] sin[180 - 13 theta)//2]` का मान क्या है?

Options

A. `sin 2 theta sin4 theta`
B. `cos 2 theta cos6 theta`
C. `sin 2 theta sin6 theta`
D. `cos 2 theta cos 4 theta`