Question

use os valores notáveis do seno e calcule a)sen 6π
b) sen 19π/4

Answer 1

a) sen 6pi = sen 3*2π = sen 2π = sen 0° = 0
--------------------------------------...
b)sen 19pi / 4

2π — 1 Circ.
19π/4 – x

x = 19π/4 : 2π = 19π/8π = 19/8 = 2 3/8 Circ.
3/8 Circ. = 3*360°/8 = 1080°/8 = 135°

sen 135° = sen 45° = √2/2