The value of cos 4A – cos 4B is
A. (cos A – cos B)*(cos A + cos B)*(cos A – sin B)*(cos A + sin B)
B. (cos A – cos B)*(cos A + cos B)*(cos A – sin B)*(cos A + sin B)
C. (cos A – cos B)*(cos A + cos B)*(cos A – sin B)*(cos A + sin B)
D. (cos A – cos B)*(cos A + cos B)*(cos A – sin B)*(cos A + sin B)
Answer:C
The value of cos 4A – cos 4B is
A. (cos A – cos B)*(cos A + cos B)*(cos A – sin B)*(cos A + sin B) B. (cos A – cos B)*(cos A + cos B)*(cos A – sin B)*(cos A + sin B) C. (cos A – cos B)*(cos A + cos B)*(cos A – sin B)*(cos A + sin B) D. (cos A – cos B)*(cos A + cos B)*(cos A – sin B)*(cos A + sin B)