Q 5 5 . P r o v e b y i n d u c t i o n t h a t f o r a l l n a t u r a l n u m b e r n cos α + cos ( α + β ) + cos ( α + 2 β ) + . . . . . . . . . + cos α + n - 1 β = cos α + n - 1 2 β sin n β 2 sin β 2 . E This question has not been answered yet! Don't worry! You can check out similar questions with solutions below C
