Find-the-value-of-S-where-S-r-1-89-sin-6-r-

Question Number 4600 by Yozzii last updated on 11/Feb/16

F i n d t h e v a l u e o f S w h e r e S = \underset{r = 1}{\sum^{89}} {s i n}^{6} r ° .

Commented by FilupSmith last updated on 11/Feb/16

{Don}^{'} t you use the series representation

for sine ?

Commented by Yozzii last updated on 11/Feb/16

{T h a t}^{'} s n o t n e c e s s a r y h e r e .

Commented by Yozzii last updated on 12/Feb/16

T r y u s i n g t h e f a c t t h a t

s i n (90 - α °) = c o s α, α \in R .

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