senp + senq = 2.(senp+q/2). cos(p-q)/2
sen60+sen30=2.(sen60+30/2). cos(60-30)/2
sen60+sen30=2.(sen45). cos(15)
sen60+sen30=2.(√2/2). cos15
sen60+sen30= √2 cos15º
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senp + senq = 2.(senp+q/2). cos(p-q)/2
sen60+sen30=2.(sen60+30/2). cos(60-30)/2
sen60+sen30=2.(sen45). cos(15)
sen60+sen30=2.(√2/2). cos15
sen60+sen30= √2 cos15º