Question

find (cos 48° - cos 12°)​

Answer 1

Answer:

Step-by-step explanation: cosA-cosB=-2sin(A+B/2)sin(A-B/2)

LET A= 48 AND B=12

-2sin(48+12/20sin(48-12/2)

-2sin(60/2)sin(36/2)

-2sin30sin18

-2*1/2sin18

-sin18

-(root5-1)/4