Question

Calcule: 3Cos(120°) + 4. Sen(135°) + 5. Sen( 330°) + 4. Cos(150°)

Answer 1

Resposta:

$2 \sqrt{2} - 2 \sqrt{3} - 4$

.1 cos 120° = -1/2

.2 sen135°= √2/2

.3 sen330°= -1/2

.4 cos150°= -√3/2

3(-1/2) + 4.√2/2 + 5(-1/2) + 4(-√3/2)= -3/2 + 2√2 -5/2 -2√3 = 2√2- 2√3 -4