Question

evaluar: sen( x + π/4)​

Answer 1

Partimos de la identidad sen(a + b) = sen a cos b + sen b cos a

sen(x + π/4) = sen x cos π/4 + sen π/4 cos x

sen π/4 = cos π/4 = √2/2

sen(x + π/4) = √2/2 . (sen x + cos x)