Question

Genteee me ajuda!!! ​

Answer 1

Resposta:

Explicação passo-a-passo:

a) sen(60/2) - 3.sen(3.60) + sen(9.60/2) =

sen30 - 3sen180 + sen270 =

1/2 - 3.0 + (-1) = -1/2

b) sen(7.180/2) . sen(180/6) =

sen630 . sen30 // sen 630 = sen270 // 1 volta e 3/4 no ciclo trigonométrico

-1 . 1/2 = -1/2

c) sen90 . sen60 + sen330 . sen315 . sen180 =

1 . $\sqrt{3}$/2 + (-$\sqrt{3}$/2) . -($\sqrt{2$/2) . 0 =

$\sqrt{3}$/2

d) (sen30 + sen2.30)/(sen7.30 - 3sen3.30) =

(1/2 + $\sqrt{3}$/2) / (-1/2 - 3.1) =

(1 + $\sqrt{3}$)/2 / (-7/2) =

(1 + $\sqrt{3}$) / -7

e) cos 450 . cos315 + cos45 . cos210 =

0 . $\sqrt{2$/2 + $\sqrt{2$/2 . (-1/2) =

0 - $\sqrt{2$/4 = -$\sqrt{2$/4

f) cos540 + cos270 - cos45 =

-1 + 0 - $\sqrt{2$/2 = (-1 - $\sqrt{2$)/2

g) 2.cos180 + 3.cos1080 =

2.0 +  3.1 = 3