Question

Determine os valores de: y=4 sen (-900°) -2 cos 630°+3cos 720°

Answer 1

y = 4 sen(-900°) - 2 cos630°+ 3 cos720°
y = 4 * 0 - 2 * 0 + 3 * 1
y = 0 + 0 + 1
y = 1