Question

Sendo Y = (cos270°+ cos360°)/(cos300°.cos360°-cos90°), calcule o valor de Y e marque a resposta correta

a) 2
b) – 2
c) 1
d) – 1
e) 0

Answer 1

cos 270° = 0

cos 360° = 1

cos 90° = 0

cos 300° = 1/2

Y = (0 + 1)/(1/2 . 1 - 0)

Y = 1 / 1/2

Y = 2/1 × 1

Y = 2 <= Resposta.