TRIGONOMETRI
cos x + cos y = 2 cos (x + y)/2 cos (x - y)/2
•••
(cos 3b + cos b) + 2 cos 2b
= 2 cos 2b cos b + 2 cos 2b
= 2 cos 2b (1 + cos b)
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TRIGONOMETRI
cos x + cos y = 2 cos (x + y)/2 cos (x - y)/2
•••
(cos 3b + cos b) + 2 cos 2b
= 2 cos 2b cos b + 2 cos 2b
= 2 cos 2b (1 + cos b)