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|\ -->30°
| \
a√3| \ 2a
| \
|__\ -->60°
a
De donde:
sen 30° = a / 2a = 1/2
cos 60° = a / 2a = 1/2
Resolvemos:
= 3 sen 30° + 5 cos 60°
= 3 * (1/2) + 5 * (1/2)
= 3/2 + 5/2
= 8 / 2
= 4 (Respuesta)